Bitcoin is anonymous, surely they won't find out we diverted evidence to our own wallets
An addendum from Ars Technica:
Force was a DEA agent for 15 years, from 1999 until his own agency began investigating him in 2014. His annual salary was about $150,000, but investigators saw that his personal checking accounts received at least $757,000 during the time period of April 2013 to May 2014. His wife was a homemaker during this period, and there was no additional legitimate income to the household beyond Force's salary.
How are these guys so good at turning Bitcoins back into cash?
Last I knew Coinbase.com made it pretty simple.