Also, it's possible to drug test an entire city, perhaps to decide how to budget and prepare for intervention and treatment programs. http://www.npr.org/2011/06

Also, it's possible to drug test an entire city, perhaps to decide how to budget and prepare for intervention and treatment programs. http://www.npr.org/2011/06/25/137420879/our-sewers-ourselves-what-waste-water-can-tell-us http://www.npr.org/2011/06/25/137420879/our-sewers-ourselves...