I think the DEA is a very interesting "law enforcement agency".... especially in the last 20 years. Over that period of time it has become very apparent that the ills of society are not caused by drugs and that heavy handed enforcement policies are less effective than general harm reduction policies. At the same time it has become increasingly clear that the militarized law enforcement in north america in response to the "drug epidemic" has been extremely harmful to public health.
This has resulted in an agency that is basically set up to be completely against public health (and moral) interests. There is probably not a single decent, moral person working at the DEA today by the mere virtue that the agency itself is completely counter productive to its own stated goals. This has resulted in an agency that has continually been in the news (for decades) for soliciting prostitution, murder, drug smuggling and other offenses. They are criminals, state sponsored criminals.