Having lived in Arlington for many years I finally decided to check this place out. I spent a couple of hours reading all of the display materials. I found the early history of how drugs came to this country and became an epidemic and the consequent growth of drug enforcement to be the most interesting. There is also a lot of info about various drug busts, including materials confiscated during these events. Turns out the DEA is now largely focused on prescription drug abuse and production.
I would not recommend this to families with small children or early teens since there is a lot of reading to do. Parking is located at street meters and mall garages nearby. Metro is a couple of blocks away.
This museum can be easily combined with a trip to the Pentagon and Air Force Memorials nearby.