CoinDesk has an article on this:
Khuu also allegedly used a network of financial institutions to launder the funds, including Bank of America, Citibank, JPMorgan Chase and Wells Fargo. The indictment alleged he created a number of fake accounts at these banks.
The indictment went on to describe several transactions Khuu allegedly conducted as part of his efforts to convert bitcoin into cash. All told, he allegedly conducted just under 500 transactions tied to the sale of about 620 BTC.
US Officials Charge California Resident With Using Bitcoin to Launder $5.3M in Drug Proceeds https://www.coindesk.com/policy/2022/10/07/us-officials-charge-california-resident-with-using-bitcoin-to-launder-53m-in-drug-proceeds [Archive]