The availability of certain information on cash transactions and money movements can aid law enforcement officials tracing illegal drug preceeds. The U.S. Department of the Treasury, responsible for administering the Bank Secrecy Act and its regulations, has developed procedures under which State and local law enforcement agencies can obtain information filed under the BSA. Procedures for obtaining that information are discussed in detail, and the offices to contact for filing requests are identified. Information of use to law enforcement officials is collected on Internal Revenue Form 4789 and Customs Form 4790, which are also discussed. Financial data obtained from these forms can lead to forfeiture actions and can strengthen criminal prosecutions. Appendixes contain copies of forms, the announcement of form revisions, and the names and addresses of Internal Revenue Service and Customs Services officials to contact for access to Bank Secrecy Act data.