OPINION
MURNAGHAN, Circuit Judge:The instant appeal was brought by Elic Gilliam (“Elic”) and his son Roy Lee Gilliam (“Roy Lee”) (collectively, the “Gil-liams”) who were convicted in a jury trial of multiple counts of money laundering, conspiracy, and intent to distribute marijuana and cocaine. Roy Lee has argued that he had ineffective assistance of counsel at trial because the same counsel represented both him and his father, who was a co-defendant. Both appellants also have argued that the Oregon search warrants were insufficient, that the offenses charged in the indictment regarding money laundering were unconstitutionally vague, that the Government failed properly to establish the chain of custody of certain forensic evidence, that the evidence of possession of marijuana and cocaine was insufficient, and that none of the events which led to conviction occurred in the Western District of Virginia where the trial was held.
Because we conclude that an actual conflict quite possibly developed at trial due to the joint representation of Roy Lee and Elic, we conclude that the district court erred in failing to conduct a Federal Rule of Criminal Procedure 44(c) hearing.1 Accordingly, we remand for such a hearing to be conducted in Roy Lee’s case. Finding no error, except any reversal and retrial necessity for Roy Lee which may arise as a result of the Rule 44(c) hearing, we otherwise affirm the convictions.
I.
The Gilliams were indicted on May 23, 1990 on various money laundering and drug trafficking charges, namely, (1) conspiracy to conduct and attempt to conduct financial transactions affecting interstate commerce (money laundering), in violation of 18 U.S.C. § 371; (2) money laundering, in violation of 18 U.S.C. §§ 2, 1956(a)(l)(A)(i), (B)(i) and (ii) and 31 U.S.C. §§ 5313, 5324(3) and 5322(b); (3) conspiracy with intent to distribute marijuana, in violation of 21 U.S.C. § 846; (4) possession with intent to distribute marijuana, in violation of 21 U.S.C. § 841(a)(1); and (5) possession with intent to distribute cocaine, in violation of 21 U.S.C. § 841(a)(1). In the indictment, the grand jury charged that the Gil-liams had been involved in marijuana cultivation and distribution from 1981 through February of 1990, growing marijuana on a farm in Oregon and transporting it to Virginia for distribution. The indictment also alleged that the Gilliams had spent in excess of one million dollars over and above their legitimate sources of income.
The indictments were the result of a search of a farm owned by the Gilliams in Virginia, simultaneous with a search of Elic’s farm in Oregon. On the Virginia farm the officers recovered marijuana, which was being dried by a heater, triple beam scales, drying lights, large blue trash cans, and eleven grams of cocaine. The officers also recovered approximately $117,000 cash in various places on the farm, some of which was recovered from a locked truck. Also inside the locked truck, officers located a notebook containing *1053terms such as “Big Buds,” and other purportedly marijuana-related terms.
Likewise, on the Oregon farm, officers found evidence of a recently harvested field, which they determined to have grown approximately 3,000 marijuana plants, blue trash cans containing 127 pounds of marijuana,2 triple beam scales, working gloves and tarps that smelled like marijuana, and various packages of marijuana seeds la-belled as “O Big Buds XXX,” “V Good Seed Stock,” and “V Good Stock.” 3
The same counsel represented both Roy Lee and Elic. It is undisputed that the district court never conducted a hearing as required by Rule 44(c) of the Federal Rules of Criminal Procedure. Following an eight day jury trial, a guilty verdict was returned as to all counts against the Gilliams. The instant appeal followed.
II.
A. Ineffective Assistance of Counsel
Turning to the issue of the ineffective assistance of counsel, Rule 44(c), being cast in categorial preemptive terms, provides:
Whenever two or more defendants have been jointly charged ... or have been joined for trial ... and are represented by the same retained or assigned counsel ... the court shall promptly inquire with respect to such joint representation and shall personally advise each defendant of the right to the effective assistance of counsel, including separate representation. Unless it appears that there is good cause to believe no conflict of interest is likely to arise, the court shall take such measures as may be appropriate to protect each defendant’s right to counsel.
(Emphasis added). While we have held that “in the absence of a specific objection, the trial court may assume that joint representation does not present any conflict,” that statement is limited by the additional language “unless the court knows or reasonably should know that a particular conflict exists.” United States v. Akinseye, 802 F.2d 740, 744 (4th Cir.1986), cert. denied, 482 U.S. 916, 107 S.Ct. 3190, 96 L.Ed.2d 678 (1987) (citing United States v. Ramsey, 661 F.2d 1013, 1018 (4th Cir.1981), cert. denied, 455 U.S. 1005, 102 S.Ct. 1642, 71 L.Ed.2d 874 (1982)). Thus, “if the court is aware, or should be aware, of a particular conflict, it should conduct a sua sponte inquiry into its existence.” Id. Moreover, although a defendant may waive his right to conflict-free representation, Holloway v. Arkansas, 435 U.S. 475, 483 n. 5, 98 S.Ct. 1173, 1178 n. 5, 55 L.Ed.2d 426 (1978), such waiver must be “knowing, intelligent, and voluntary.” Akinseye, 802 F.2d at 745 (citing Brady v. United States, 397 U.S. 742, 748, 90 S.Ct. 1463, 1468, 25 L.Ed.2d 747 (1970)).
With respect to waiver, we have held: Rule 44 and its notes discuss the type of waiver which the district court should secure. The court must personally address each defendant and inform him of the potential hazards of representation by a single attorney, as well as his right to separate representation. In turn, the defendants are free to ask the court questions about the nature and consequences of the representation:
Most significantly, the court should seek to elicit a narrative response from each defendant that he has been advised of his right to effective representation, that he understands the details of his attorney’s possible conflict of interest and the potential perils of such a conflict, that he has discussed the matter with his attorney and if he wishes with outside counsel, and that he voluntarily waives his Sixth Amendment protections.
Akinseye, 802 F.2d at 745 (quoting Fed.R.Crim.P. 44(c) Advisory Committee Note).
While we have emphasized the importance of the right to conflict free representation, we have held that the failure of the court to make inquiry under Rule 44(c) is not, standing alone, sufficient to require *1054reversal of a conviction. United States v. Arias, 678 F.2d 1202, 1205 (4th Cir.), cert. denied, 459 U.S. 910, 103 S.Ct. 218, 74 L.Ed.2d 173 (1982). Most circuits require a defendant who fails to object to the joint representation at trial to demonstrate, on appeal, an actual conflict of interest. See, e.g., United States v. Crespo de Llano, 838 F.2d 1006, 1008 (9th Cir.1987); United States v. Holley, 826 F.2d 331, 334 (5th Cir.1987), cert. denied, 485 U.S. 960, 108 S.Ct. 1222, 99 L.Ed.2d 422 (1988). But see United States Ex. Bel. Hart v. Davenport, 478 F.2d 203 (3rd Cir.1973) (holding that where record shows no inquiry by Court concerning conflicts in joint representation, prejudice and non-waiver should be presumed).
In the instant case, we find that Roy Lee has alleged an actual conflict, requiring a Rule 44(c) hearing. See Cuyler v. Sullivan, 446 U.S. 335, 348, 100 S.Ct. 1708, 1718, 64 L.Ed.2d 333 (1980). Four days into the jury trial, the Government offered Roy Lee and Elic a plea agreement wherein Elic would be sentenced to ten years imprisonment and Roy Lee would be sentenced to seven years. The terms of imprisonment that the two would face if they accepted the agreement would have meant that probably Elic would spend the rest of his life in jail; while Roy Lee, a relatively young man, would not. According to Roy Lee, Elic vehemently opposed accepting the plea agreement, contending that he did not want to spend his final days in jail and insisting that they could beat the charges together.
On appeal, Roy Lee has contended that if he had his own attorney he would have been talked into taking the plea arrangement. The trial attorney, when faced with one client who wished to accept the plea and one who did not, was unable to provide effective assistance to both clients in that situation, he has contended.
New counsel appeared for Roy Lee at sentencing and orally advised the court of the alleged conflict of interest which, he said, had come to light because Roy Lee had discussed it with his mother. The district court did not hold a hearing, but ruled that (i) the ineffective assistance of counsel argument had been made too late and (ii) the district court judge did not witness anything during trial that would suggest either a conflict or ineffective assistance of counsel.
We hold that the district court should have held a 44(c) hearing when the issue of a conflict was raised, albeit at the last minute, at sentencing. The lower court should have held an evidentiary hearing to determine (i) whether there was a conflict and (ii) if so, whether it rendered assistance to Roy Lee ineffective. Therefore, we remand the case to the district court to conduct such a Rule 44(c) hearing.4
By remanding the case, we do not mean to dictate the result to be reached by the lower court when it exercises its discretion in such matters. There exists substantial evidence, although not on the district court record, to suggest that either (i) the conflict was manufactured out of whole cloth, or (ii) there exists no remedy to redress the conflict because the plea bargain offered to Roy Lee during trial is no longer available. There is also no suggestion that the alleged conflict impaired the ability of counsel to present the case to the jury. The conflict is involved only insofar as it allegedly impaired the ability of Mr. Rasnick to advise Roy Lee independently of the merits of the plea arrangement.5
*1055 B.Insufficiency of Search Warrants Executed in Oregon
Next, the Gilliams have contended that the district court erred in permitting the introduction of evidence seized in Oregon because the search warrant for Elie’s Oregon farm contained a defective boundary description in that it erroneously stated that the property bordered the Snake River. Because the property did not border the Snake River, the Gilliams claim that the search warrant was defective.
In determining the sufficiency of the description of a place to be searched, the key is “whether the place to be searched is described with sufficient particularity to enable the executing officer to locate and identify the premises with reasonable effort, and whether there is any reasonable probability that another premises might be mistakenly searched.” United States v. McCain, 677 F.2d 657, 660 (8th Cir.1982).
In the instant case, the initial search warrant, providing for an aerial search, contained the following description:
A parcel of land approximately 45.5 acres containing one dwelling, a large storage building, a dilapidated small house, a smaller outbuilding, being the only farm on the N.E. corner of Ripple Road and Buckhorn Road in Malheur county, Oregon commonly referred to as the Weiser annex bordered by Buckhorn Road. On the S.W. boundary a standing cornfield, on the S.E. boundary the Snake River, on the East boundary and a standing cornfield on the North and N.W. boundaries.
The only inaccuracy in the foregoing description apparently is the fact that the farm at issue does not border the Snake River. However, the search warrant describes the farm as “the only farm on the N.E. corner of Ripple Road and Buckhorn Road in Malheur County, Oregon commonly referred to as the Weiser Annex bordered by Buckhorn Road.” (Emphasis added). As such, the warrant described the farm with particularity and was sufficient to avoid the risk of a search of the wrong property. Therefore, we conclude that the warrant was sufficient to support the search and the evidence obtained from the Oregon farm is not excludable on that basis.
C. Chain of Custody of Certain Forensic Evidence
The Gilliams also have argued that the district court erred in admitting certain forensic evidence obtained from the Virginia search because the chain of evidence was not properly established. Based upon the evidence in the record, we find that the government established a sufficient chain of custody. See United States v. Howard-Arias, 679 F.2d 363, 365-66 (4th Cir.), cert. denied, 459 U.S. 874, 103 S.Ct. 165, 74 L.Ed.2d 136 (1982). Accordingly, the district court did not err in refusing to exclude evidence based upon the Gilliams’ argument that an insufficient chain of custody existed.
D. Unconstitutional Vagueness Argument With Respect to Money Laundering Statutes
Next, the Gilliams have maintained that the money laundering statutes under which they were convicted are unconstitutionally vague in that the crimes are not described with sufficient certainty so that ordinary persons can determine what conduct is criminalized. The Government, on the other hand, argues that the statutes are not vague and that even if vague, the Government introduced sufficient evidence *1056to demonstrate that the Gilliams understood the money laundering prohibitions.
The statutes at issue, 18 U.S.C. §§ 1956(a)(l)(B)(i) and (ii) provide, inter alia, that:
(a)(1) Whoever, knowing that the property involved in a financial transaction represents the proceeds of some form of unlawful activity, conducts or attempts to conduct such a financial transaction which in fact involves the proceeds of a specified unlawful activity—
(A)(i) with the intent to promote the carrying on of specified unlawful activity; or
(B) knowing that the transaction is designed in whole or in part—
(i) to conceal or disguise the nature, the location, the source, the ownership, or the control of the proceeds as specified unlawful activity; or
(ii) to avoid a transaction reporting requirement under state or federal law,
is guilty of money laundering in violation of the statute. In evaluating a criminal statute under the void for vagueness doctrine, the Supreme Court has established a two part test, stating first that “[a] penal statute must define the criminal offense with sufficient definiteness that ordinary people can understand what conduct is prohibited.” Kolender v. Lawson, 461 U.S. 352, 357, 103 S.Ct. 1855, 1858, 75 L.Ed.2d 903 (1983). Second, the criminal offense must be described “in a manner that does not encourage arbitrary and discriminatory enforcement.” Id. Moreover, “vagueness challenges to statutes not threatening First Amendment interests are examined in light of the facts of the case at hand; the statute is judged on an as-applied basis.” Maynard v. Cartwright, 486 U.S. 356, 361, 108 S.Ct. 1853, 1857-58, 100 L.Ed.2d 372 (1988).
As applied to the Gilliams, we conclude that the statute is not vague. To prove a case under section 1956(a)(l)(B)(i) or (ii), “the government must prove that the transaction was designed to conceal one or another of the enumerated attributes of the proceeds involved.” United States v. Jackson, 935 F.2d 832, 838-39 (7th Cir.1991) (citing United States v. Sanders, 928 F.2d 940, 946 (10th Cir.1991)). Therefore, the Government must prove a specific intent to structure a transaction so as to conceal the true nature of the proceeds. Id. Requiring the proof of specific intent satisfies the first element of the void for vagueness test, in that the convicted must have had notice that the conduct is proscribed in order to have the specific intent required for the money laundering crime. Jackson, 935 F.2d at 839. See also Boyce Motor Lines, Inc. v. United States, 342 U.S. 337, 342, 72 S.Ct. 329, 331, 96 L.Ed. 367 (1952); Hoffman Estates v. Flipside, Hoffman Estates, Inc., 455 U.S. 489, 499, 102 S.Ct. 1186, 1193, 71 L.Ed.2d 362 (1982).
In the instant case, the Government introduced evidence showing that the Gil-liams intended to structure their transactions so as to avoid the reporting requirements and so as to hide the fact that the funds being used were drug proceeds. The Government introduced evidence that the Gilliams had spent one million dollars over and above any legitimate sums of income. An Internal Revenue Special Agent, Tom Semesky, testified that the Gilliams had structured their bank deposits to avoid reporting requirements for transactions involving $10,000. Semesky also testified that the Gilliams had structured a land purchase in Scott County in order to accumulate capital for the purchase. Testimony indicated that in purchasing the property, the Gilliams brought in $18,000 in cash and a check, requesting three separate receipts, two for $9,000 each and another for the check, presumably to avoid the reporting requirements.
The Government also introduced the testimony of Katherine Miller with the Farmer’s Home Administration who testified that the Gilliams made their loan payments in cash and that she had informed Roy Lee that if he brought in more than $10,000 she would have to report it to the IRS. She testified that upon informing Roy Lee of that fact, he replied to the effect that banks also do that. Furthermore, testimony of employees at the First American *1057Bank in Kingsport, Tennessee indicated that they had discussed the reporting requirement with the Gilliams. A teller at the bank testified that when Roy Lee brought in $9,000 in cash for deposit, she informed him that she would report the amount, whereupon he said he thought the reporting amount was $10,000. Then, he started bringing in deposits of approximately $5,000 to $6,000 and the teller again informed him that she was required to report $5,000 transactions. Following that conversation, he began to bring in $4,500 or less in cash. The foregoing testimony is more than sufficient evidence that the Gil-liams understood the reporting requirements and how to structure their deposits to avoid such reporting. Therefore, as applied to the Gilliams, the statute is not vague with respect to the first issue because the evidence was sufficient to show that the Gilliams possessed the requisite intent, which implicitly confirms that they had notice of what conduct was proscribed.
Turning to the second issue, whether the statute is sufficiently defined so as to circumscribe discretionary enforcement, we conclude that the numerous and detailed definitions of the terms used in the money laundering statute sufficiently curtails the discretion of law enforcement officers. Jackson, 935 F.2d at 839.
E. Sufficiency of the Evidence
Next, the Gilliams have argued that the Government failed to establish either actual or constructive possession of drugs necessary for a conviction for possession with intent to distribute. We review the sufficiency of the evidence in the light most favorable to the Government. Glasser v. United States, 315 U.S. 60, 80, 62 S.Ct. 457, 469, 86 L.Ed. 680 (1942).
There was clearly enough evidence to establish constructive possession of the drugs. When the search was executed on the property owned and occupied by the Gilliams, marijuana was found in a variety of places, triple beam scales were found, drying lights, large sums of cash and a notebook with writing discussing “Big Buds” and other marijuana-related terms. Furthermore, at trial Elic’s ex-wife testified that he had been cultivating marijuana since 1981. Claude Sloan testified that he had seen Roy Lee weighing and bagging marijuana and Ricky Sloan testified that he had weighed marijuana with Roy Lee in Elic’s basement. With respect to the cocaine, the officer executing the search testified that he located the 11.25 grams of cocaine in a mason jar which was situated under a plastic tarp to the side of Elic’s driveway, approximately 30 feet from the house. Furthermore, marijuana residue was found along with the cocaine. Under such circumstances, viewing the evidence in the light most favorable to the government, we determine that the evidence is sufficient to support the Gilliams’ convictions of possession with intent to distribute marijuana and cocaine.
F. Sufficiency of Proof that Money Laundering Crimes Occurred in Virginia
Finally, the Gilliams have contended that there was no evidence that the offenses were committed in the Commonwealth of Virginia or in the Western District of Virginia. The Gilliams have argued that since they banked in Tennessee, and since the cultivation of marijuana occurred in Oregon, no evidence links them with the commission of a crime in the Commonwealth. Therefore, they argue that venue was improper in the Western- District of Virginia.
It is clear that an offense committed in more than one district may be prosecuted in any district that such offense was begun, continued, or completed. 18 U.S.C. § 3237(a). Furthermore, a conspiracy may be prosecuted in any district in which the agreement was formed or in which an act in furtherance of the conspiracy was committed. United States v. Lewis, 676 F.2d 508, 511 (11th Cir.), cert. denied, 459 U.S. 976, 103 S.Ct. 313, 74 L.Ed.2d 291 (1982). In the instant case, the evidence was sufficient to support venue in the Western District of Virginia.
The Gilliams’ farm was located in Virginia and evidence was recovered therefrom *1058which indicated that the Gilliams were trafficking drugs. With respect to the money-laundering convictions, evidence at trial indicated that the Gilliams had purchased property in Scott County by structuring the capital to avoid the reporting requirements, in violation of the money laundering statutes. Furthermore, the evidence indicated that the Gilliams made numerous land payments in cash on a variety of Virginia properties, which payments were made from money earned in trafficking drugs. The foregoing amounts to sufficient evidence linking the Gilliams with the Commonwealth for purposes of venue.
III.
To sum up, we remand to the district court to conduct a Federal Rule of Criminal Procedure 44(c) hearing to determine whether Roy Lee was deprived of the effective assistance of counsel because of the joint representation of himself and Elic. In all other respects, the district court’s opinion is affirmed.
REVERSED AND REMANDED IN PART AND AFFIRMED IN PART.
. That rule provides:
Whenever two or more defendants have been jointly charged ... or have been joined for trial ... and are represented by the same retained or assigned counsel ... the court shall promptly inquire with respect to such joint representation and shall personally advise each defendant of the right to the effective assistance of counsel, including separate representation. Unless it appears that there is good cause to believe no conflict of interest is likely to arise, the court shall take such measures as may be appropriate to protect each defendant’s right to counsel.
. The blue trash cans found on the Oregon farm were identical to those found on the Virginia farm.
. Officers testified at trial that such labels were used by drug traffickers to refer to the grade of marijuana.
. Assuming that up until the time of the government’s offer of the plea agreement there was no conflict of interest between father, Elic, and son, Roy Lee, there may well have developed a conflict upon the offer of the plea agreement. The joint representation by single counsel may then have brought about conflict since, had Roy Lee accepted the deal, the government probably would have required, as a condition of the plea bargain, that Roy Lee testify against his father, Elic. In this situation of direct conflict, the lawyer might be constrained from correctly and properly advising both clients.
. See Cuyler v. Sullivan, 446 U.S. 335, 348, 100 S.Ct. 1708, 1718, 64 L.Ed.2d 333 (1980) (holding that "in order to establish a violation of the Sixth Amendment, a defendant who raised no objection at trial must demonstrate that an actual conflict of interest adversely affected his lawyer’s performance”).
During oral argument, Mr. Rasnick, who represented both Elic and Roy Lee at trial and Elic *1055on appeal, was questioned about the conflict. He told the panel that he explained to his clients at the outset of the case the possible conflicts involved when an attorney represents two defendants in a criminal case, and that they elected to proceed with him (he was retained rather than court-appointed).
During trial, Mr. Rasnick strongly recommended to both clients that they accept the plea bargain, which he characterized as a "mighty fine deal.” Both Roy Lee and Elic, he said, decided to reject the deal and take their chances with the jury. Mr. Rasnick saw nothing to suggest that the elder Gilliam prevailed upon the younger to reject, albeit reluctantly, the government’s plea bargain.
Roy Lee did not first contend that his father talked him out of accepting the plea bargain until shortly before the sentencing. In fact, the argument about the conflict was not raised in the district court until the day of sentencing.