31 C.F.R. § 1021.313
In the case of a casino, multiple currency transactions shall be treated as a single transaction if the casino has knowledge that they are by or on behalf of any person and result in either cash in or cash out totaling more than $10,000 during any gaming day. For purposes of this section, a casino shall be deemed to have the knowledge described in the preceding sentence, if: Any sole proprietor, partner, officer, director, or employee of the casino, acting within the scope of his or her employment, has knowledge that such multiple currency transactions have occurred, including knowledge from examining the books, records, logs, information retained on magnetic disk, tape or other machine-readable media, or in any manual system, and similar documents and information, which the casino maintains pursuant to any law or regulation or within the ordinary course of its business, and which contain information that such multiple currency transactions have occurred.
31 C.F.R. § 1021.313