The judgment of the Court was announced by
STEIN, J.N.J.S.A. 2A:81-12 permits the introduction into evidence of a witness’s prior convictions for the purpose of affecting the credibility of that witness. We interpreted that statute in State v. Sands, 76 N.J. 127, 386 A.2d 378 (1978), and concluded that whether a prior conviction may be admitted to impeach a testifying criminal defendant is a decision that rests within the sound discretion of the trial court. In Sands, we set forth broad guidelines for trial courts to follow in deciding whether the probative value of a prior conviction with respect to credibility outweighs the likelihood that its admission will create undue prejudice. Id. at 147, 386 A.2d 378.
*380In this case we consider whether admission into evidence of defendant’s prior convictions for offenses similar to the charged offenses unfairly prejudiced defendant. We also consider whether evidence of prior convictions similar to charged offenses generally should be “sanitized” by limiting the evidence of prior similar-crime convictions so that the jury is not informed of the substantial similarity of the prior crime to the charged crime. Finally, we address defendant’s claim that the State failed to establish an uninterrupted chain of custody sufficient to permit the introduction into evidence of cocaine found at the crime scene.
I
In October 1988, while investigating reports of narcotics activity, Elizabeth Police Department plainclothes detectives Koczur, Shields, and Owsiany observed defendant and an unidentified man in front of a telephone booth. According to Detective Koczur’s testimony, defendant gave the other man a small item in exchange for an amount of money. Detective Shields stopped his unmarked police vehicle, and as Detective Koczur alighted from the vehicle, the unidentified man fled. He was not apprehended.
Detective Koczur approached defendant in what Koczur described as a “casual manner.” Defendant reached into his right pants pocket, turned towards the telephone and, without depositing any money, began dialing. Detective Koczur testified that as he had approached defendant, he had observed that the telephone receiver was “on the hook.” As Koczur continued to approach him, defendant reached into his waistband and removed several glass vials containing a white powdery substance. He dropped the vials to the ground. Detective Koczur immediately informed defendant that he was under arrest. According to Koczur’s testimony, defendant attempted to break away from the detective, and as the two struggled, defendant stepped on the vials, “crushing them and kicking them in all *381directions.” Detectives Shields and Owsiany intervened, and defendant was eventually handcuffed.
Detective Koczur put defendant in the police car while Detectives Shields and Owsiany attempted to scrape off the ground the white powdery substance they believed to be cocaine. The powder was mixed with crushed glass and colored plastic caps. Detective Shields testified that he had used a cigarette box and cellophane tape to collect the remnants of the powder. At police headquarters Detective Koczur completed a property slip for the cigarette box and put his name, the case number, and his initials on the property bag before sealing it. The bag was then placed in the police department safe. Detective Koczur also searched defendant and found in his jacket pocket $160 in twenty-dollar denominations; in his front right pants pocket, a crushed twenty-dollar bill; and in his front left pants pocket another six dollars. Detective Koczur did not find any evidence of narcotics on defendant’s person.
Defendant was indicted for third-degree possession of a controlled dangerous substance, cocaine; third-degree possession of a controlled dangerous substance, cocaine, with intent to distribute; fourth-degree resisting arrest; and fourth-degree hindering apprehension or prosecution.
At a pre-trial hearing, the State indicated that if defendant were to testify, it would offer defendant’s prior convictions to impeach his credibility. In 1987, defendant had pleaded guilty to possession of a controlled dangerous substance, possession of a controlled dangerous substance with intent to distribute, and theft. The trial court, in accordance with our decision in Sands, considered the remoteness and seriousness of the prior convictions. Noting that the predominant criterion of Sands is remoteness, the court stated:
In this particular matter I find that when we look at the main criteria of remoteness, we are talking about a very short period of time. * * *
These particular crimes that the defendant pleaded guilty to involve possession of a controlled dangerous substance as well as a theft charge and they *382certainly, in my opinion are the types of evidence matters that could very well affect credibility * * *.
Over defendant’s objection, the trial court ruled that defendant’s prior convictions would be admissible to impeach defendant’s credibility if he were to testify.
At trial, Detective Koczur testified to the alleged drug transaction and defendant’s subsequent struggle with the detectives. Investigator Jose Martinez of the Union County Narcotics Strike Force, qualified as an expert in drug distribution, testified that the plastic caps retrieved from the sidewalk fit into glass vials that, when filled with cocaine, would sell for twenty dollars. Martinez testified that in his opinion defendant had possessed cocaine with the intent to distribute.
Defendant did not testify at trial. He was advised by counsel that he had a right to testify and that the State could introduce his prior convictions to affect his credibility. He was also informed that he was entitled to have the jury instructed that it could not draw any adverse inference from his silence. Defendant declined such a charge. The sole witness for the defense was defendant’s former girlfriend, Robin Johnson. Ms. Johnson testified that at the time of the alleged transaction, defendant had called her from a pay telephone to discuss their plans to go to the movies that evening. She testified that they had been on the telephone for approximately twenty minutes and that their conversation had ended when the phone had disconnected because defendant was not there to deposit more money.
The jury returned a “guilty” verdict on all counts. For sentencing purposes, the trial court merged the possession and possession-with-intent-to-distribute counts. Pursuant to the State’s motion, the court sentenced defendant to an extended term of six-years imprisonment with a mandatory minimum of three years. N.J.S.A. 2C:43-6f. The court also imposed fines and penalties totaling $1,300.
Defendant appealed, arguing that the trial court should have sanitized the evidence of his prior controlled-dangerous-sub*383stance convictions or, in the alternative, should have excluded them because they were not a reflection of defendant’s lack of veracity. Defendant also contended that if the Appellate Division were to reject those two alternatives, it should conclude that the trial court had abused its discretion by failing to distinguish the prior convictions in respect of their relevance to credibility, observing that the theft conviction alone would have impeached his credibility sufficiently. Defendant also alleged error in the trial court’s admission into evidence of the cocaine that had been scraped from the sidewalk, contending that the State had failed to establish an uninterrupted chain of custody.
In an unpublished opinion, the Appellate Division rejected defendant’s contentions and affirmed the convictions. We granted defendant’s petition for certification raising substantially the same arguments, 130 N.J. 13, 611 A.2d 652 (1992).
II
N.J.S.A. 2A:81-12 states:
For the purpose of affecting the credibility of any witness, his interest in the result of the action, proceeding or matter or his conviction of any crime may be shown by examination or otherwise, and his answers may be contradicted by other evidence. Conviction of crime may be proved by the production of the record thereof, but no conviction of an offender shall be received in evidence against him in a civil action to prove the truth of the facts upon which the conviction was based.
In Sands, supra, 76 N.J. 127, 386 A.2d 378, we reviewed the history of the statute and determined that N.J.S.A. 2A:81-12 does not mandate the admission of every prior conviction of a testifying defendant. Id. at 147, 386 A.2d 378. We recognized that Evidence Rule 4 embodies a reservoir of judicial discretion. That Rule provides:
The judge may in his discretion exclude evidence if he finds that its probative value is substantially outweighed by the risk that its admission will * * * (b) create substantial danger of undue prejudice or of confusing the issues or of misleading the jury.
Recognizing the competing values underlying N.J.S.A. 2A:81-12 and Rule 4, we held in Sands that
*384[t]he trial judge shall admit evidence of criminal convictions to affect credibility of a criminal defendant unless in his discretion he finds that its probative force because of its remoteness, giving due consideration to relevant circumstances such as the nature of the crime, and intervening incarcerations and convictions, is substantially outweighed so that its admission will create undue prejudice. By recognizing this discretionary power in the trial judges, we shall have removed an obstacle “in their conscientious efforts to insure fair trial and do justice.”
[76 N.J. at 147, 386 A.2d 378 (quoting State v. Hawthorne, 49 N.J. 130, 149, 228 A.2d 682 (1967) (Jacobs, J. concurring)).]
N.J.S.A. 2A:81-12 is based on the widespread belief that a criminal conviction is probative of a witness’s credibility. Hawthorne, supra, 49 N.J. at 145, 228 A.2d 682:
"[T]here is a basis in reason and experience, why one may place more credence in the testimony of one who has lived within the rules of society and the discipline of the law than in that of one who has so demonstrated antisocial tendency as to be involved in and convicted of serious crime.”
[Sands, supra, 76 N.J. at 143, 386 A.2d 378 (quoting State v. Harless, 23 Utah 2d 128, 459 P.2d 210, 211 (1969)).]
The Sands holding also is predicated on the assumption that one who previously has been convicted of a crime may evade the truth to avoid a subsequent conviction.
Nevertheless, we have recognized in the context of Evidence Rule 55 that other-crimes evidence may be simultaneously probative and prejudicial. State v. Stevens, 115 N.J. 289, 300, 558 A.2d 833 (1989). Evidence Rule 55 bars the introduction into evidence of other crimes to prove a defendant’s criminal nature but permits introduction of other-crimes evidence to prove a fact in issue at trial. In Stevens, supra, we noted the tendency of other-crimes evidence to turn a jury against a defendant. Id. at 302-03, 558 A.2d 833. The prejudice inherent in other-crimes evidence, even when it is probative of a fact in issue, is that a jury, on hearing that evidence, may be influenced to return a guilty verdict because it considers the defendant to be a criminal. See State v. Cofield, 127 N.J. 328, 336, 605 A.2d 230 (1992). The inflammatory nature of other-crimes evidence also may influence juries unduly when that evidence is admitted for impeachment purposes under N.J.S.A. 2A:81-12.
*385In an effort to mitigate the prejudice of a prior conviction introduced to impeach the credibility of a testifying defendant, we have held that the trial court must explain carefully to the jury the limited purpose of prior-conviction evidence. Sands, supra, 76 N.J. at 142 n. 3, 386 A.2d 378 (citing State v. Sinclair, 57 N.J. 56, 63, 269 A.2d 161 (1970)). Despite a trial court’s efforts to limit the prejudicial impact of prior convictions, criminal defendants often choose not to testify in order to keep the prior-conviction evidence from the jury. See Harry Kalven, Jr. & Hans Zeisel, The American Jury 146 (1966) (reporting that 74% of defendants with a criminal record testified as compared to 91% of those defendants without a record). A defendant who fails to testify, however, also withholds his or her version of the facts from the jury. In addition, silence may suggest to the jury that the defendant has something to hide, a concern that may be tempered by the trial court’s instruction to the jury that it should not draw an adverse inference from a defendant’s silence. Carter v. Kentucky, 450 U.S. 288, 302,-101 S.Ct. 1112, 1120, 67 L.Ed.2d 241, 252 (1981); State v. Bogus, 223 N.J.Super. 409, 422, 538 A.2d 1278 (App.Div.), certif. denied, 111 N.J. 567, 546 A.2d 497 (1988).
Although prior-conviction evidence is effective in impeaching a defendant’s credibility, concern frequently is raised about the extent to which juries consider that evidence as proof of guilt. Commentators generally agree that the use of prior-conviction evidence is fraught.with a high risk of prejudice, and they express skepticism about the effectiveness of an instruction to the jury to limit its use of the evidence to an assessment of defendant’s credibility. See James E. Beaver & Steven L. Marques, A Proposal to Modify the Rule on Criminal Conviction Impeachment, 58 Temp.L.Q. 585 (1985); James H. Gold, Sanitizing Prior Conviction Impeachment Evidence to Reduce Its Prejudicial Effects, 27 Ariz.L.Rev. 691 (1985); Robert G. Spector, Impeaching the Defendant by his Prior Convictions and the Proposed Federal Rules of Evidence: A Half Step Forward and Three Steps Backward, 1 Loy.U.ChLL.J. *386247 (1970); Ed Gainor, Note, Character Evidence by Any Other Name * * *: A Proposal to Limit Impeachment by Prior Conviction Under Rule 609, 58 Geo.Wash.L.Rev. 762 (1990); Note, To Take the Stand or Not to Take the Stand: The Dilemma of the Defendant with a Criminal Record, 4 Colum.J.L. & Soc.Probs. 215 (1968). Critics of prior-conviction impeachment evidence are concerned with a jury’s tendency to convict a defendant if it knows the defendant previously has committed a crime. As one commentator explains, “The theory of ‘limited use’ under which such explosive evidence is put before the jury fails to correspond to the actual effect of the evidence even in the minds of the most sober and conscientious jurors.” H. Richard Uviller, Evidence of Character to Prove Conduct: Illusion, Illogic, and Injustice in the Courtroom, 130 U.Pa.L.Rev., 845, 882 (1982). The risk that juries will use such evidence for an impermissible purpose is particularly high if the prior conviction is for a similar crime. Gold, supra, 27 Ariz.L.Rev. at 692. Nevertheless, the rationale for admitting prior-conviction evidence is that a jury is able to follow a trial court’s limiting instruction and consider evidence of a prior conviction only to assess a defendant’s credibility and not consider such evidence in assessing the likelihood of his or her guilt.
Professors Wissler and Saks conducted a study of jurors’ use of prior-conviction evidence, predicting that “[i]f the law’s rationale is correct, more convictions would result when the prior conviction is for perjury; but if jurors are misusing the information, more convictions would result from a prior conviction for the same crime * * Roselle L. Wissler & Michael J. Saks, On the Inefficacy of Limiting Instructions, 9 J.L. & Hum.Behav. 37, 39 (1985). They concluded that prior-conviction evidence did not affect significantly the predisposition of jurors to doubt the credibility of criminal defendants. However, their study determined that the rate of conviction varied depending on the type of crime previously committed, the highest conviction rate resulting when the prior crime was the *387same as the charged offense. Id. at 43. Those results corroborated the findings of several earlier studies. See Anthony N. Doob & H.M. Kirshenbaum, Some Empirical Evidence on the Effect of s. 12 of the Canada Evidence Act Upon the Accused, 15 Crim.L.Q. 88 (1972); Valerie P. Hans & Anthony N. Doob, Section 12 of the Canada Evidence Act and the Deliberations of Simulated Juries, 18 Crim.L.Q. 235 (1975).
Other jurisdictions have acknowledged and attempted to address the problem presented when a defendant previously has been convicted of a similar offense. One approach has been to exclude evidence of a prior conviction if it is similar .to the offense charged and other convictions are available to impeach a defendant. United States v. Bagley, 772 A.2d 482 (9th Cir.1985) (considering similarity of prior conviction and availability of other dissimilar prior convictions, court concluded that admission of prior conviction for robbery to impeach defendant on trial for robbery was error), cert, denied, 475 US. 1023, 106 S.Ct. 1215, 89 L.Ed.2d 326 (1986); Gordon v. United States, 383 A.2d 936, 940 (D.C.Cir.1967) (“[Wjhere multiple convictions of various kinds can be shown, strong reasons arise for excluding those which are for the same crime because of the inevitable pressure on lay jurors to believe that ‘if he did it before he probably did so this time.’ ”), cert, denied, 390 U.S. 1029, 88 S.Ct. 1421, 20 L.Ed.2d 287 (1968). In other states, evidence of prior convictions is inadmissible to impeach the credibility of a testifying defendant. Ga. Code- Ann. § 24-9-20 (1992); Kan. Stat.Ann. § 60-421 (1983); Mont.R.Evid. 609; State v. Santiago, 53 Haw. 254, 492 P.2d 657, 661 (1971) (convicting “a criminal defendant where prior crimes have been introduced to impeach his credibility as a witness violates the accused’s constitutional right to testify in his own defense”).
Several courts have allowed the prosecution to introduce evidence of a criminal defendant’s prior conviction of a crime similar to the charged offense without permitting evidence of the specific crime, a procedure often referred to as “sanitization.” See State v. Geyer, 194 Conn. 1, 480 A.2d 489 (1984) *388(recommending sanitization of prior convictions not directly reflecting on credibility); Waller v. State, 395 A.2d 365 (Del. 1978) (sanitizing all prior convictions); Commonwealth v. Richardson, 674 S.W.2d 515 (Ky.1984) (same); State v. Pitts, 212 Neb. 295, 322 N.W.2d 443 (1982) (same); State v. McClure, 298 Or. 336, 692 P.2d 579 (1984) (sanitizing similar prior convictions); State v. Rutchik, 116 Wis.2d 61, 341 N.W.2d 639 (1984) (sanitizing all prior convictions). Sanitization of a defendant’s prior convictions allows the jury to use evidence of such convictions to assess credibility; however, exclusion of any evidence describing the specific offense reduces the risk of impermissible use by the jury.
The rule in this state for admission of prior convictions to affect credibility does not distinguish between crimes that involve dishonesty and those that do not. The analogous federal rule and several similar state formulations mandate the admission of evidence of crimes involving dishonesty and false statements and permit the introduction of other felony convictions if the probative value outweighs the prejudicial effect. See, e.g., Fed.R.Evid. 609(a); Fla.Stat.Ann. § 90.610(1) (1992); Ark.R.Evid. 609(a);. Tenn.R.Evid. 609(a); Wash.R.Evid. 609(a). The New Jersey Legislature rejected Uniform Rules of Evidence R. 21 proposed by a Supreme Court Committee on Evidence, which would have limited the admission of prior-conviction evidence to those convictions involving dishonesty or false statement. 1963 Report of Supreme Court Committee on Evidence, Rule 21 at 65-66. The Legislature thus expressed its view that any prior conviction has probative value with respect to a criminal defendant’s credibility.
In State v. Pennington, 119 N.J. 547, 575 A.2d 816 (1990), we declined the defendant’s invitation to adopt the “Connecticut rule” and require that a prior murder conviction be sanitized before admission into evidence to impeach a testifying defendant at his capital-murder trial. Id. at 585-87, 575 A.2d 816. During a robbery of a family-run neighborhood tavern, Frank Pennington shot and killed Arlene Connors. In a sworn state*389ment to the police, Pennington admitted to the robbery and the shooting, acknowledging that after the other customers had left, he drew a gun, with three safeties, and demanded the money in the cash register. Although admitting that he had removed the safeties, Pennington claimed that he had not intended to hurt anyone and had shot the victim after she had thrown a glass of beer at him. Pennington also told the police that he did not “feel like [he] really meant to shoot her, [he] just pointed the gun and it went off.” Id. at 558, 575 A.2d 816. The State disputed the defendant’s version of the shooting. The trial court held a pre-trial hearing and ruled admissible for impeachment purposes two burglary convictions, an armed-robbery conviction, and a murder conviction. The defendant did not take the stand in his own defense.
The critical issue at trial was Pennington’s mental state. The substance of his sworn statement was introduced through the testimony of a police officer. Ibid. Thus, the jury heard Pennington’s admission of the shooting. He was ultimately convicted of felony murder and knowing or purposeful murder. At the penalty phase, the prosecution introduced evidence of Pennington’s prior murder conviction. Id. at 585, 575 A.2d 816.
Because Pennington had admitted the robbery and the shooting of the victim in the course of the robbery, Pennington’s responsibility for the victim’s death was not disputed. The issue that the jury was to resolve was the specific form of homicide that Pennington had committed, which depended largely on the jury’s conclusions about his state of mind. “On the evidence, it was virtually a foregone conclusion that [Pennington] would be convicted of some kind of homicide. Defendant did not dispute that he shot the victim * * *.” Id. at 570, 575 A.2d 816.
Nevertheless, on direct appeal, after reversing the defendant’s capital conviction and death sentence based on State v. Gerald, 113 N.J. 40, 549 A.2d 792 (1988), we considered the defendant’s contention that the trial court had erred in not *390ruling that his prior murder conviction should have been sanitized before admission into evidence to impeach Pennington if he were to testify at trial. 119 N.J. at 585-87, 575 A.2d 816. We recognized the potential prejudicial effect on a capital defendant of the admission of a prior murder conviction but were not persuaded to depart from the rule of Sands. Id. at 586, 575 A.2d 816. We noted that the potential prejudice must be weighed against the countervailing consideration that serious crimes should be given weighty effect, and expressed concern that prejudice might ensue from jury speculation about the nature of the crime if that information were not revealed. Ibid. We observed that admission of evidence of the defendant’s prior murder conviction during the penalty phase of Pennington’s trial diminished the persuasive force of the argument that sanitization would prevent the jury from hearing that he had previously been convicted of murder. Id. at 587, 575 A.2d 816. In retrospect, our focus on the admissibility of Pennington’s prior murder conviction undoubtedly was affected by our recognition that the prior conviction could be relevant only to Pennington’s credibility on the question of his state of mind at the time of the homicide, but would not have been influential on the question of Pennington’s responsibility for the victim’s death, that issue having been conceded by Pennington’s statement to the police.
Ill
In Sands, supra, we held that trial courts should admit evidence of a prior criminal conviction unless, because of its remoteness, its probative force on the issue of the defendant’s credibility is substantially outweighed by the prejudicial effect of its admission. 76 N.J. at 147, 386 A.2d 378. Recognizing that a jury might use a prior conviction as evidence of a defendant’s criminal disposition and not as evidence probative of a defendant’s credibility, we noted that trial courts must explain carefully to juries the limited purpose for which the prior-conviction evidence may be used. Id. at 142 n. 3, 386 A.2d *391378 (citing Sinclair, supra, 57 N.J. at 63, 269 A.2d 161). In Stevens, supra, we expressed our concern that a limiting instruction may not cure the prejudice inherent in other-crimes evidence admitted under Rule 55. 115 N.J. at 309, 558 A.2d 833. On occasion, we have found a trial court’s limiting instruction insufficient to combat the prejudicial impact of Rule 55 evidence. See Cofield, supra, 127 N.J. at 341-42, 605 A.2d 230 (“The trial court’s failure to focus the jury’s attention on the limited purpose for which the evidence was admissible allowed the jury such free rein that it was clearly capable of confusing propensity with [the charged offense].”).
The introduction into evidence of a similar prior conviction to impeach a testifying defendant is doubtless highly prejudicial, and that prejudice is unlikely to be cured by a limiting instruction. A limiting instruction imposes on a juror the difficult burden of distinguishing the subtle difference between the impermissible use of prior-conviction evidence to assess the likelihood of a defendant’s guilt, and the permitted use of the same evidence to assess that defendant’s credibility. Nevertheless, just as the State may impeach the credibility of a defendant who has been convicted of a dissimilar crime, the State is entitled to impeach the credibility of a criminal defendant who previously has been convicted of a similar crime.
To accommodate those competing principles, we modify our ruling in Sands and hold that in those cases in which a testifying defendant previously has been convicted of a crime that is the same or similar to the offense charged, the State may introduce evidence of the defendant’s prior conviction limited to the degree of the crime and the date of the offense but excluding any evidence of the specific crime of which defendant was convicted. That method of impeachment will insure that a prior offender does not appear to the jury as a citizen of unassailable veracity and simultaneously will protect a defendant against the risk of impermissible use by the jury of prior-conviction evidence. The balance struck adequately vindicates the State’s interest in using the prior conviction to cast *392doubt on the defendant’s credibility without subjecting defendant “to the extraordinary prejudice that follows if the prior crime was specifically named or described.” Pennington, supra, 119 N.J. at 607, 575 A.2d 816 (Handler, J., concurring in part, dissenting in part). “The difference between lack of credibility as a repetitive felon and lack of credibility as a repetitive car thief was negligible to the prosecution, catastrophic to the accused.” Bendelow v. United States, 418 F.2d 42, 53 (5th Cir.1969) (Godbold, J., concurring in part, dissenting in part), cert, denied, 400 U.S. 967, 91 S.Ct. 379, 27 L.Ed.2d 387 (1970).
A defendant wary of jury speculation about the unspecified offense may introduce evidence of the nature of the prior conviction. Sanitization of prior-conviction evidence of similar crimes merely limits the scope of the prosecution's cross-examination of a defendant to the date, degree, and number of similar prior convictions. A defendant may choose to waive the protection afforded by that limitation.
We no longer adhere to our holding in Pennington to the extent that it is inconsistent with the foregoing conclusion. We note that the prior-conviction issue in that case was presented as plain error and arose in the context of a capital trial in which the defendant had admitted his responsibility for the victim’s death, but contested whether he possessed the requisite state of mind to support a conviction for murder. Thus, our refusal to reverse the trial court’s admission of evidence of Pennington’s prior murder conviction reflected the practical recognition that in the context of the cumulative weight of Pennington’s inculpatory statements, admission of that evidence would not have affected the jury’s determination concerning Pennington’s responsibility for the victim’s death, and might have had only a marginal impact on the jury’s assessment of Pennington’s credibility with respect to his state of mind.
Prior to defendant’s trial in the instant case, the court ruled admissible for impeachment purposes defendant’s prior convic*393tions for possession of a controlled dangerous substance, possession of a controlled dangerous substance with intent to distribute, and theft. Defendant contends that to avoid the prejudicial effect of the introduction into evidence of the two similar prior convictions, he did not testify at trial. He concedes the admissibility of his theft conviction.
Because that pre-trial ruling is in conflict with the rule we now adopt for admission of evidence of prior similar convictions, we reverse defendant’s conviction and remand for a new trial. We note that only two of defendant's three prior convictions are similar to the offenses presently charged. If on retrial the State should choose to introduce all three prior convictions for impeachment purposes, the trial court should sanitize all three convictions to avoid the speculation that inevitably would occur if evidence were introduced to prove the theft conviction and the convictions of the unidentified crimes. Alternatively, the State may prefer to introduce only the theft conviction, in which case evidence of the nature of that offense may be admitted.
IV
Defendant also contends that the State failed to establish an uninterrupted chain of custody of the cocaine seized at the crime scene and admitted into evidence. Because we reverse defendant’s conviction on other grounds, we need not address that contention in detail.
A party introducing tangible evidence has the burden of laying a proper foundation for its admission. That foundation should include a showing of an uninterrupted chain of possession. State v. Brown, 99 N.J.Super. 22, 27, 238 A.2d 482 (App.Div.), certif. denied, 51 N.J. 468, 242 A.2d 16 (1968). When the custodian is a State agency, the State is not obligated to negate every possibility of substitution or change in condition of the evidence. Ibid. Such evidence generally should be admitted if the trial court “finds in reasonable probability that *394the evidence has not been changed in important respects or is in substantially the same condition as when the crime was committed.” Id. at 28, 238 A.2d 482 (citations omitted).
At trial, Detective Koczur testified to the usual police procedure for identifying, safeguarding, and processing narcotics seized in the course of an arrest. He then identified the cigarette box containing crushed glass and white powder that he had secured at the time of defendant’s arrest. He further testified that with the exception of the addition of the Uniori County Prosecutor’s laboratory identification numbers, the evidence was in the same condition as when he had confiscated it. The cigarette box was then, without objection, admitted into evidence.
Defendant did not object to the admission of the evidence at trial. Neither does he offer any proof of substitution or tampering. The trial court properly admitted the cigarette box containing crushed glass and cocaine and properly denied defendant’s motion for acquittal on the chain-of-custody basis.
V
To impeach the credibility of a testifying defendant, the State may introduce into evidence only the number, degree, and date of the defendant’s prior similar convictions. When a defendant has multiple prior convictions, some of which are similar to the charged offense and some of which are dissimilar, the State may introduce evidence only of the date and degree of crime of all of the defendant’s prior convictions, but cannot specify the nature of the offenses. Alternatively, the State may introduce without limitation evidence of only the dissimilar convictions. That modification of the manner in which the State may impeach the credibility of a testifying defendant will apply only prospectively, affording defendant in this case the benefit of our decision. See State v. Burstein, 85 N.J. 394, 403, 427 A.2d 525 (1981).
*395The judgment of the Appellate Division is reversed, and the case is remanded to the Law Division for retrial.