The DEA — like other federal agencies involved in surveillance — buys and deploys malware and exploits. However, it seems to do better than most at picking out the sketchiest malware purveyors to work with.
When Italian exploit retailer Hacking Team found itself hacked, obtained emails showed the company liked to route around export bans through middlemen to bring the latest in surveillance malware to UN-blacklisted countries with horrendous human rights records. It also, apparently, sold its wares to the DEA — an agency in a country with only periodic episodes of horrendous human rights violations.