Actually it's the Secret Service that tracks money laundering. Contrary to popular belief, that is actually their main job -- protecting the currency of the United States. Protecting the President is just their side job.
You're partly right though -- up until 2003 they were part of the Treasury department, but they were re-orged into DHS when it was created.
You're partly right: Treasury's Financial Crimes Enforcement Network is one of the lead agencies that combat money laundering. There's a huge amount of overlap though.
You're partly right though -- up until 2003 they were part of the Treasury department, but they were re-orged into DHS when it was created.
But your point is still valid.