Also, it&#x27;s possible to drug test an entire city, perhaps to decide how to budget and prepare for intervention and treatment programs. <a href="http:&#x2F;&#x2F;www.npr.org&#x2F;2011&#x2F;06&#x2F;25&#x2F;137420879&#x2F;our-sewers-ourselves-what-waste-water-can-tell-us" rel="nofollow">http:&#x2F;&#x2F;www.npr.org&#x2F;2011&#x2F;06&#x2F;25&#x2F;137420879&#x2F;our-sewers-ourselves...</a>