HSBC and Wachovia were recently involved in the laundering of hundreds of billions of dollars for Mexico's biggest drug cartel (and pretty much every executive involved came out unscathed once it was revealed).
When I bought drugs in high school, it was usually in cash. Sure, I concede multi-million dollar operations may have bank help, but I don't think you're thinking about the full picture.
https://www.theguardian.com/commentisfree/2015/feb/15/hsbc-h...