Well, in part, it's not a good idea to throw stones at glass houses and if you are a regular reader of Inspectors General's reports on various agencies it quickly becomes evident that the agencies tasked with stopping said crime are just trying their hardest not to do that.

A few that just involve the improper handling or oversight in conducting money laundering operations that came out this past year, which, because of the pandemic and politics, have seen fewer IG reports than usual:

https://oig.justice.gov/reports/audit-drug-enforcement-admin...

https://www.oig.dhs.gov/sites/default/files/assets/2020-09/O...