1. When an AML Inquiry Becomes a Criminal Search
Financial institutions monitor unusual transactions under federal anti-money laundering requirements. A compliance review may lead to a criminal investigation, but a bank's suspicion and the legal authority needed to search private property are different matters.
Suspicious Activity Reports and Financial Records
Banks may submit Suspicious Activity Reports (SARs) to the Financial Crimes Enforcement Network (FinCEN). These reports provide investigative information but neither establish guilt nor authorize officers to search a residence or personal device.
Under Bank Secrecy Act requirements, banks must provide SAR supporting documentation to FinCEN or appropriate law enforcement or supervisory agencies upon request. FinCEN guidance permits disclosure of these records without a separate subpoena or warrant. Other financial records may require different legal authority, and the Right to Financial Privacy Act may affect federal government access.
Suspicious Transactions and Criminal Charges
New York Penal Law Article 470 defines several money laundering offenses. Depending on the charge, prosecutors must establish the required knowledge, transaction purpose, criminal proceeds, or statutory value threshold. An unusual transfer alone does not establish these elements.
A money laundering defense addresses whether the prosecution can prove the offense. A warrant challenge examines whether investigators obtained the evidence lawfully. The two issues require separate analysis.
2. Probable Cause and the Limits of a Search Warrant
The Fourth Amendment restricts unreasonable searches and seizures. Under Criminal Procedure Law (CPL) §§ 690.35 and 690.40, a warrant application must establish reasonable cause to believe specified property may be found at the designated location.
What Establishes Probable Cause for a Search
A warrant application must contain factual allegations supporting the proposed search. The issuing judge evaluates whether those facts establish a sufficient connection between suspected criminal activity, the property sought, and the location.
Investigators must provide more than generalized suspicion. The application should identify relevant evidence and facts linking it to the proposed search location. Information from confidential sources may also require examination of reliability and supporting circumstances. These questions frequently arise in white collar investigations involving financial records or electronic communications.
Searches Beyond the Authorized Scope
CPL § 690.45 requires a warrant to describe the property sought and identify the place or person to be searched. Authorization to examine specified financial evidence does not automatically permit an unrestricted search for unrelated criminal activity.
Digital searches require particular attention because phones and computers may contain extensive personal information. Courts examine the warrant's language, the methods officers used, and how they discovered disputed material. Finding unrelated files does not itself establish a violation, but a search exceeding lawful authority may support suppression.
3. When a Defendant Can Seek Suppression
CPL § 710.20 permits an aggrieved defendant to challenge certain unlawfully obtained evidence. A suppression motion must identify a recognized legal defect rather than merely dispute the accuracy of financial records.
Grounds for Excluding Financial Evidence
A defendant may challenge a warrant lacking probable cause, an overly broad authorization, or a search exceeding its lawful scope. The defendant generally must establish a personal legal basis for contesting the search. Ownership, possession, and reasonable expectations of privacy may affect that determination.
Suppression is not automatic. Evidence obtained from an independent lawful source or falling within another recognized exception may remain admissible. Even if a court excludes particular records, prosecutors may continue the case using other admissible evidence.
Filing Deadlines and Suppression Hearings
CPL §§ 710.40 and 255.20 generally require pretrial suppression motions within 45 days after arraignment. Certain discovery disclosures, statutory extensions, and subsequently discovered grounds may affect the filing deadline.
Under CPL § 710.60, written motions must identify legal grounds and supporting sworn factual allegations. Courts may deny legally insufficient motions without a hearing. When material factual disputes require resolution and statutory hearing requirements are satisfied, the court conducts a suppression hearing.
Evidence obtained during grand jury investigations may require particular attention to disclosure and motion timing. The availability of investigative records can affect when a defendant has sufficient information to raise an objection.
4. State and Federal Rules for Reviewing Evidence
The court handling the prosecution determines the applicable criminal procedure. State and federal money laundering charges may involve similar financial records, but different statutes and procedural requirements govern the proceedings.
Federal Money Laundering Investigations
Federal offenses under 18 U.S.C. §§ 1956 and 1957 contain distinct statutory elements. Federal Rule of Criminal Procedure 12(b)(3)(C) generally requires available suppression challenges before trial, subject to the court's filing deadline.
A court may consider an untimely motion upon a showing of good cause. State filing deadlines do not automatically govern federal prosecutions, even when investigators examined transactions involving the same financial institutions.
Evidence Preservation and Independent Sources
Defendants should preserve available warrants, seizure inventories, transaction records, correspondence, and investigative notices. Electronic files should remain intact because altering records or deleting communications may create separate legal problems.
Investigators may obtain the same financial information through different lawful channels. A successful challenge to one search does not necessarily exclude independently acquired records or eliminate the prosecution's remaining evidence. An attorney must identify the precise source of each disputed item before evaluating suppression.
5. Frequently Asked Questions
Can I Refuse to Answer Questions During an AML Investigation?
The Fifth Amendment generally protects individuals against compelled self-incriminating testimony. A person may ordinarily decline a voluntary law enforcement interview, but subpoenas and formal proceedings create different obligations.
The privilege does not automatically excuse every document request. Its application depends on the circumstances, the nature of the requested information, and whether a recognized exception applies.
Can My Bank Freeze My Account Without Criminal Charges?
An account restriction does not necessarily mean criminal charges have been filed. Banks may restrict account activity under applicable law and account agreements, including during certain compliance reviews.
Government seizure or restraint requires separate legal authority. When authorities have restrained funds, asset seizure and forfeiture procedures may provide distinct grounds and procedures for objection.
6. Reviewing Evidence before a Suppression Deadline
A warrant challenge requires examining the authorization, collection methods, and source of disputed evidence. The relevant records may include the warrant application, supporting affidavits, seizure inventory, and available investigative notices.
When those records raise questions about probable cause or an unauthorized search, a criminal defense attorney can assess potential suppression grounds and filing deadlines. That review should distinguish evidence exclusion from defenses addressing the underlying money laundering charge.
15 Oct, 2026
