The way things work like this (based on court filings publicly available). Imagine some madam is involved in sex trafficking in the states. She comes under the

The way things work like this (based on court filings publicly available). Imagine some madam is involved in sex trafficking in the states. She comes under the radar of police and other investigative agencies. These agencies gather all circumstantial evidence, but still this evidence doesn't pass muster to convict this madam. However, she goes around and deposits at various ATMs of different banks (say, Chase, PNC, USBank). She thinks that she is smart by depositing $6K (split across three banks) every week. Over the time, AML algos at these banks look at the sliding window of her cash deposits: $10K every five weeks at every bank, and her profession doesn't match up to the story. All three banks file SARs with Fincen. Now the prosecutors dig through FinCen database, and convict her on the structuring charges, instead of sex trafficking. That's what Beria's law is: "Show me the man, I will find you the crime".