Seriously, though. Given all the things drug addicts often do if driven to them, is it wise to give them an incentive to, say, poop into a bag and eventually t

Seriously, though. Given all the things drug addicts often do if driven to them, is it wise to give them an incentive to, say, poop into a bag and eventually throw it into someone else's trash? I was wondering whether the technology was at the level where it could track it down to an individual. Struck me as implausible, but then the article says "policing" and that it was successfully used to "help track down" a manufacturer, but further thought shows that "help track down" might just mean "it helped narrow it down to a neighborhood" or something. I'm sure they wouldn't install in every apartment things that take samples at every different tenant's toilets. But they might take very broad samples, and then, when they find positive results in one area, they could add more sampling to its sub-areas, and narrow it down progressively, and eventually say "We now have cause to search the rooms of everyone in this apartment building for drugs".