Frederick G. Jackson appeals from a judgment, entered on his guilty plea, convicting him of conspiracy to possess cocaine with intent to deliver, as a second or subsequent offense, see §§ 961.41(lx), 961.16(2)(b)l, 961.41(lm)(cm)l, & 961.48, Stats., and from the trial court's order denying his motion for post-conviction relief. He claims that the trial court should have ruled inadmissible the test results of a sample of his urine that, was taken by hospital personnel, and that the trial court should have suppressed what he told a police officer. He also contends that he was deprived of his constitutional right to effective assistance of counsel. We affirm.
I.
On May 29, 1997, Milwaukee police officers were investigating a report they had received complaining about gunshots when they saw Jackson driving fast on a Milwaukee street. It was around 10:30 p.m. They stopped Jackson. According to the testimony of one of *332the arresting officers at the preliminary examination, Jackson had "some white substance" that looked like cocaine "[a]ll over his mouth and teeth." When one of the officers asked Jackson what was in his mouth, he fled.
Jackson was ultimately stopped and arrested. The officers called an ambulance, which took Jackson to a hospital, where his urine sample was collected and analyzed. The record does not reveal the official results of the urine test but, apparently, it showed that he had cocaine in his system. Although arrested on May 29, Jackson was not given a probable-cause hearing until June 5, 1997.
On June 2, 1997, Jackson was interviewed by a Milwaukee police detective. As the detective gave Jackson the warnings required by Miranda v. Arizona, 384 U.S. 436 (1966), Jackson asked if the detective could arrange for him to see a lawyer. The detective testified:
I told him I could not do that, and that I was going to end my interview with him. He stated he wanted to talk to me now. I stated that he would have to waive his right to an attorney and he would have to be very clear about that which he stated yes, he did want to do that because he wanted to cooperate in giving a statement and answering my questions.
According to the detective, Jackson "initiated then by saying that he wanted to talk to me, and he was very, very persistent about that, and I simply told him I couldn't because he wanted a lawyer, and he continued with that, and I told him the only way this would take place is by him waiving that right to me verbally, stating that he no longer wanted the lawyer and then I could proceed." Jackson then waived his right to an *333attorney. Jackson told the detective about his involvement in a cocaine transaction.
On cross-examination, the detective testified that in giving Jackson his Miranda warnings, he told him that the lawyer would be appointed for him "once charges were established" and that then "the Public Defender's Office would step in for his defense."
Jackson testified at the suppression hearing that when he asked for a lawyer the detective told him:
[I]t would look good that you're not a hardened criminal if you would proceed to make a statement without the lawyer, because at that point what he was saying to me, that, you know, if I was really going to come clean like that why am I hiding behind the attorney. That was the general impression that I get, and I wanted the attorney because I didn't want to believe it.
Jackson retreated from this assertion, however, in the following exchange during his cross-examination by the assistant district attorney:
Q He [the detective] never said: Well, if you're not a hardened criminal you wouldn't be saying it [asking for a lawyer], did he?
A He didn't say it in that direct term, no.
Jackson also admitted that he never told the detective that he would not answer any more questions, and that the detective did not physically force him to answer his questions.
The trial court found that the warnings required by the Miranda decision "were given and they were complied with." The trial court also found that, based in part on Jackson's extensive prior experience with the criminal justice system and its perception that *334Jackson was "a fairly intelligent" person, Jackson made a "knowing and intelligent waiver" of his rights under the Miranda decision.
II.
Jackson makes three arguments in support of his bid for vacatur of his guilty plea. First, he claims that the trial court should have ruled inadmissible the results of the urine test that was done at the hospital. Second, he argues that the trial court should have suppressed his statement to the detective. Third, he contends that his lawyer was ineffective for failing to raise and litigate an alleged violation of County of Riverside v. McLaughlin, 500 U.S. 44 (1991). We analyze de novo legal issues, including questions of constitutional fact, raised by Jackson's contentions. See State v. Williams, 220 Wis. 2d 458, 464, 583 N.W.2d 845, 847 (Ct. App. 1998). On the other hand, the trial court's findings of historical fact are given great deference and will not be overturned unless they are "clearly erroneous." See Rule 805.17(2), Stats, (made applicable to criminal proceedings by § 972.11(1), Stats.); Williams, 220 Wis. 2d at 464, 583 N.W.2d at 847.
A. Urine test.
Jackson's first claim of error is that the trial court should have excluded the results of the hospital urinalysis. We assume, without deciding, that his appeal on this point is permitted by § 971.31(10), Stats. (A defendant may appeal from an order denying a motion to suppress evidence or a motion challenging the admissi*335bility of the defendant's statement even though the judgment of conviction rests on a guilty plea.).1
Jackson conceded before the trial court, and also concedes here, that there is no Fourth Amendment issue if hospital personnel took the urine sample without being directed to do so by the police. He also conceded before the trial court that this is what happened. Jackson's trial lawyer explained to the trial court that he filed his motion to suppress the results of the urine test because he "assumed, and I guess wrongly, that the urine was forcibly seized at the direction of the police," and that one of the officers told him "that they didn't ask or direct the seizure of anything." Nevertheless, Jackson faults the trial court for not holding an evidentiary hearing on the issue, and argues in his appellate brief that "[s]ince the state. offered no evidence as to how the urine sample was obtained, the trial court should have ruled in favor of Jackson." This has it all wrong.
*336Although the State has the ultimate burden of proof on suppression issues, see State v. Taylor, 60 Wis. 2d 506, 519, 210 N.W.2d 873, 880 (1973), the defendant has the burden of production and must produce some evidence that makes a prima facie showing that the State violated one of his rights, see Rakas v. Illinois, 439 U.S. 128, 132 n.1 (1978) ("The proponent of a motion to suppress has the burden of establishing that his own Fourth Amendment rights were violated by the challenged search or seizure."); United States v. de la Fuente, 548 F.2d 528, 533-534 (5th Cir. 1977) (defendant has initial burden to show that government acted illegally), cert. denied, 431 U.S. 932, 434 U.S. 954. On evidentiary issues, Jackson, like any litigant, has the burden of establishing the applicability of an eviden-tiary privilege. See Franzen v. Children's Hosp. of Wis., Inc., 169 Wis. 2d 366, 388 n.41, 485 N.W.2d 603, 611 n.41 (Ct. App. 1992) (party asserting privilege has burden of proof on that issue); United States v. Wilson, 798 F.2d 509, 512 (1st Cir. 1986) (party asserting privilege has burden of proof on that issue); see also United States v. Cuozzo, 962 F.2d 945, 949 (9th Cir. 1992) (burden on defendant to move to strike inadmissible evidence), cert. denied, 506 U.S. 978.
Jackson did not pursue, beyond a passing reference, his alternate theory that the urinalysis and its subsequent disclosure to the State violated his physician/patient privilege. Indeed, Jackson concedes in his brief on this appeal that "the record [is] devoid of any evidence concerning how the urine sample was obtained from" him. By acquiescing in the officer's representation, and by not either producing evidence or making an offer of proof to the contrary, and by also not *337proffering either evidence or an offer of proof on the patient/physician privilege issue, Jackson abandoned his motion to exclude the results of the urinalysis. See State v. Woods, 144 Wis. 2d 710, 716, 424 N.W.2d 730, 732 (Ct. App. 1988) (motion made but not pursued is abandoned). A party must do more than simply toss a bunch of concepts into the air with the hope that either the trial court or the opposing party will arrange them into viable and fact-supported legal theories. Jackson's first claim of trial-court error is without merit.
B. Miranda rights.
Edwards v. Arizona,.451 U.S. 477 (1981), declared that when a person in custody tells an interrogating officer that the person wants a lawyer, that person "is not subject to farther interrogation by the authorities until counsel has been made available to him, unless the accused himself initiates further communication, exchanges, or conversations with the police." Id., 451 U.S. at 484-485. However, "Miranda does not require that attorneys be producible on call, but only that the suspect be informed, as here, that he has the right to an attorney before and during questioning, and that an attorney would be appointed for him if he could not afford one," and that if "the police cannot provide appointed counsel, Miranda requires only that the police not question a suspect unless he waives his right to counsel." Duckworth v. Eagan, 492 U.S. 195, 204 (1989). This is precisely what the trial court found happened here. Jackson's argument that he was somehow misled into giving up his Miranda rights because the detective told him that he would be given a public-defender lawyer "once charges were established" is without merit.
*338Although defendants can, of course, have access to lawyers before charges are formally lodged, the detective's inaccurate assertion was not a violation of the Miranda prophylactic rule; Duckworth recognized that in the real world, rigid, verbatim adherence to ideal Miranda warnings is not required:
We have never insisted that Miranda warnings be given in the exact form described in that decision. In Miranda itself, the Court said that "[t]he warnings required and the waiver necessary in accordance with our opinion today are, in the absence of a fully effective equivalent," prerequisites to the admissibility of any statement made by a defendant.
. . . Reviewing courts therefore need not examine Miranda warnings as if construing a will or defining the terms of an easement. The inquiry is simply whether the warnings reasonably "convely] to [a suspect] his rights as required by Miranda."
Duckworth, 492 U.S. at 202-203 (footnote and quoted sources omitted; bracketing by Duckworth). Thus, Duckworth held that a police officer's advice to a suspect undergoing custodial interrogation that he would get a lawyer "if and when you go to court" passed Miranda muster, and that his confessions could be used against him. See Duckworth, 492 U.S. at 197, 198, 204-205. This was also the rule in Wisconsin prior to Duckworth. See Jones v. State, 69 Wis. 2d 337, 342-345, 230 N.W.2d 677, 681-683 (1975) (cited with approval in Duckworth, 492 U.S. at 201 n.2); see also State v. Schindler, 146 Wis. 2d 47, 49-51, 429 N.W.2d 110, 111-112 (Ct. App. 1988) (" 'If you cannot afford a lawyer, the public defender's office will determine *339whether one will be appointed for you,'" did not violate Miranda.).
The dissent argues that the detective misinformed Jackson as to whether the detective could have left Jackson alone and called the public defender's office to get an emergency appointment of a lawyer for Jackson. Assuming that to be true, there is neither evidence nor an offer of proof in the record that the detective knew he could have both left Jackson alone to make the call and gotten the public defender's office to implement its emergency-appointment procedures. We will not circumvent Duckworth merely because a police officer makes an inadvertent comment that later detailed analysis indicates may have been mistaken.2 Moreo*340ver, even deliberate misstatements by the police comprise but one factor in determining whether a defendant has voluntarily relinquished the right not to undergo custodial interrogation. See Frazier v. Cupp, 394 U.S. 731, 737-739 (1969); State v. Woods, 117 Wis. 2d 701, 724-728, 345 N.W.2d 457, 469-71 (1984), habeas corpus granted sub nom. Woods v. Clusen, 605 F. Supp. 890 (E.D. Wis. 1985) (Frazier not discussed), aff'd, 794 F.2d 293 (7th Cir. 1986) (Frazier not discussed); State v. Fehrenbach, 118 Wis. 2d 65, 66-67, 347 N.W.2d 379, 380 (Ct. App. 1984). There is nothing in the appellate record here that indicates that a lawyer would have appeared in time for the interrogation if the detective had done what the dissent faults him for not doing. Most significant, however, is that the detective told Jackson that he would not talk to Jackson because Jackson wanted a lawyer. The detective told Jackson that Jackson would get a lawyer later. Jackson did not want to wait. Under the law, that was Jackson's choice. There is nothing in the record that even hints that Jackson's ability to make a free and rational choice not to wait was impaired by what the detective told him. The trial court did not err in refusing to suppress Jackson's statement to the detective.
C. Alleged ineffective assistance of counsel.
Although not stated specifically, Jackson's claim that he was denied effective assistance of counsel underpins his desire to withdraw his guilty plea. A *341defendant who seeks to withdraw a guilty plea after sentence has been imposed "carries the heavy burden of establishing, by clear and convincing evidence," that withdrawal of the plea is necessary "to correct a 'manifest injustice.'" State v. Washington, 176 Wis. 2d 205, 213, 500 N.W.2d 331, 335 (Ct. App. 1993) (quoted source omitted). "[T]he 'manifest injustice' test is met if the defendant was denied the effective assistance of counsel." State v. Bentley, 201 Wis. 2d 303, 311, 548 N.W.2d 50, 54 (1996).
County of Riverside requires that, as a "general matter," persons not arrested on warrants have a probable-cause hearing within forty-eight hours of arrest. 500 U.S. at 56. As noted, although Jackson was arrested on the night of May 29, 1997, he was not arraigned until June 5, 1997. On its surface, this appears to be a violation of County of Riverside, inasmuch as there is nothing in the record that indicates how long and for what reason Jackson was kept at the hospital. We do know, however, that a Milwaukee police detective interviewed Jackson at Milwaukee's Criminal Justice Facility on the morning of June 2, 1997. Thus, Jackson was out of the hospital at least by then, and his arraignment was thus after the forty-eight-hour period expired — even assuming, but not deciding, that the forty-eight-hour period was tolled during Jackson's hospitalization. We will also assume for the purposes of this opinion that Jackson's interrogation by the police detective was outside the forty-eight-hour parameters established by County of Riverside. Accordingly, we turn to whether the failure of Jackson's lawyer to seek to suppress Jackson's statement to the police detective on County of Riverside grounds was ineffective assistance in violation of the United States and Wisconsin constitutions.
*342Every criminal defendant has a Sixth Amendment right to the effective assistance of counsel, see Strickland v. Washington, 466 U.S. 668, 686 (1984), and a coterminous right under Article I, § 7 of the Wisconsin Constitution, see State v. Sanchez, 201 Wis. 2d 219, 226-236, 548 N.W.2d 69, 72-76 (1996). In order to establish a violation of this right, a defendant must prove two things: (1) that his or her lawyer's performance was deficient; and, if so, (2) that "the deficient performance prejudiced the defense." Strickland, 466 U.S. at 687; see also Sanchez, 201 Wis. 2d at 236, 548 N.W.2d at 76.
A lawyer's performance is not deficient unless he or she "made errors so serious that counsel was not functioning as the 'counsel' guaranteed the defendant by the Sixth Amendment." Strickland, 466 U.S. at 687. The defendant must also prove prejudice; that is, he or she must demonstrate that the trial lawyer's errors "were so serious as to deprive the defendant of a fair trial, a trial whose result is reliable." Ibid. Put another way: "In order to show prejudice, '[t]he defendant must show that there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different. A reasonable probability is a probability sufficient to undermine confidence in the outcome.'" Sanchez, 201 Wis. 2d at 236, 548 N.W.2d at 76 (bracketing by Sanchez ) (quoting Strickland, 466 U.S. at 694).
In assessing a defendant's claim that his or her counsel was ineffective, a court need not address both the deficient-performance and prejudice components if the defendant does not make a sufficient showing on one. See Strickland, 466 U.S. at 697; Sanchez, 201 Wis. *3432d at 236, 548 N.W.2d at 76. Moreover, a defendant is not entitled to an evidentiary hearing on an ineffective-assistance-of-counsel claim unless he or she " 'alleges facts which, if true, would entitle the defendant to relief.’" Bentley, 201 Wis. 2d at 309, 548 N.W.2d at 53. This presents a question of law that we review de novo. See id., 201 Wis. 2d at 310, 548 N.W.2d at 53. Bentley reiterated the criteria that a defendant who claims that he or she would not have pled guilty but for a lawyer's deficient performance must satisfy in order to make a prima facie showing of prejudice:
This court has long held that the facts supporting plea withdrawal must be alleged in the petition and the defendant cannot rely on conclusory allegations, hoping to supplement them at a hearing. A defendant must do more than merely allege that he would have pled differently; such an allegation must be supported by objective factual assertions.
While Wisconsin courts have long held that conclusory allegations without factual support are insufficient, they have not specifically discussed the type of facts necessary to warrant a hearing. The nature and specificity of the required supporting facts will necessarily differ from case to case. However, a defendant should provide facts that allow the reviewing court to meaningfully assess his or her claim.
Id., 201 Wis. 2d at 313-314, 548 N.W.2d at 54-55 (internal citations and footnote omitted). Mere self-serving conclusions will not suffice. See id., 201 Wis. 2d at 316, 548 N.W.2d at 56. Rather, the defendant "must also allege facts which allow the court to meaningfully assess his claim of prejudice." Id., 201 Wis. 2d at 318, 548 N.W.2d at 57.
*344Jackson's motion is bereft of any allegation, no less any factual support for any such allegation, that he would not have pled guilty if his lawyer had sought to suppress his statement to the detective because of an alleged violation of the County of Riverside decision.3 Moreover, he has not made any offer of proof to support a conclusion that such a motion would have been successful. See Kimmelman v. Morrison, 477 U.S. 365, 375 (1986) (defendant who alleges that counsel was ineffective for withdrawing a suppression motion must show that the motion would have succeeded). Accordingly, the trial court was not required to hold an evidentiary hearing on his claim. See Bentley, 201 Wis. 2d at 309-310, 548 N.W.2d at 53. Nevertheless, the trial court could have, within the proper exercise of its discretion, held an evidentiary hearing even though such a hearing was not required. See ibid.
*345A trial court "properly exercises its discretion when it has examined the relevant facts, applied the proper legal standards, and engaged in a rational decision-making process." Id., 201 Wis. 2d at 318, 548 N.W.2d at 57. In its written decision denying Jackson's postconviction motion, the trial court noted that "there was no indication that the delay caused defendant to give a statement to police officers." A County of Riverside violation, without more, does not entitle a defendant to suppress any statement the defendant might have made during the period of unlawful delay, absent a showing that the statement was produced as a result of the delay. See State v. Koch, 175 Wis. 2d 684, 699-700, 499 N.W.2d 152, 160 (1993). The trial court's decision was, therefore, consistent with "proper legal standards," and was, therefore, well within the ambit of its discretion.
By the Court. — Judgment and order affirmed.
Jackson's lawyer told the trial court that in light of his concession that the Fourth Amendment was not implicated by the taking and analysis of Jackson's urine, he "was not asking it to be suppressed. I'm asking that it be excluded by the physician patient privilege or in the larger sense, it has no relevance here. The State, nobody ever charges someone with possession simply based on the substance being in one's body." Thus, the urinalysis issue may not survive Jackson's guilty plea. See State v. Nelson, 108 Wis. 2d 698, 702, 324 N.W.2d 292, 294-295 (Ct. App. 1982) (section 971.31(10), STATS., does not apply to mere evidentiary rulings). In light of our view that Jackson abandoned his motion to exclude the results of the analysis of his urine, however, we do not decide this issue. See Gross v. Hoffman, 227 Wis. 296, 300, 277 N.W. 663, 665 (1938) (only dispositive issue need be addressed).
Indeed, although, as the dissent points out, the police officer in Duckworth v. Eagan, 492 U.S. 195 (1989), described accurately the state-law procedure in that case, see id., 492 U.S. at 204, Duckworth was based on a more fundamental principle: namely, that all a person in custody need be told is that he or she does not have to talk to the police until that person has a lawyer. The dissent in Duckworth, written by the same justice who wrote Frazier v. Cupp, 394 U.S. 731 (1969), makes this clear:
That the warning given to Eagan "accurately described the procedure for the appointment of counsel in Indiana," ante, at 204, does nothing to mitigate the possibility that he would feel coerced into talking to the police. Miranda, it is true, does not require the police to have a "station house lawyer" ready at all times to counsel suspects taken into custody. 384 U.S., at 474. But if a suspect does not understand that a lawyer will he made available within a reasonable period of time after he has been taken into custody and advised of his rights, the suspect may decide to talk to the police for that reason alone. The threat of an indefinite deferral of interrogation, in a system like Indiana’s, thus constitutes an effective means by which the police can pressure a suspect to speak without the presence of counsel. Sanctioning such police practices simply because the warnings given do not misrepresent state law does *340nothing more than let the state-law tail wag the federal constitutional dog.
Duckworth, 492 U.S. at 218 (Marshall, J. dissenting) (emphasis in original). The dissent in Duckworth reads much like the dissent here, but, of course, a dissent is what the law is not.
Jackson's postconviction motion in connection with the alleged Violation of County of Riverside v. McLaughlin, 500 U.S. 44 (1991), and his assertion that his trial lawyer was deficient in failing to seek suppression of Jackson's statement to the detective as a result, read as follows:
3. Defendant also moves the court for a hearing on whether a probable cause determination was made within 48 hours of the defendant being arrested and taken into custody on May 29, 1997 pursuant to the holding of County of Riverside v. McLaughlin, 500 U.S. 44 (1991) and, if not, whether the statement taken on June 2,1997 was inadmissible because it was the fruit of a Riverside violation, on the ground that the court record in this action shows that a probable cause determination was not made until Juné 5, 1997, seven (7) days after defendant's arrest.
4. Alternatively, Defendant moves the court for a hearing on whether Defendant's trial counsel rendered ineffective assistance of counsel for not raising and/or presenting the court with the above issues, arguments and evidence.