Supposedly they're also waste monitoring for drug use & this isn't exactly cutting edge technology. Its been around for a decade or so. If you're a hassle, they arrest you with cause if you wee thc. Seemed like the sort of thing most people on this forum might wanna know about.
Keep a straight face and keep the lid D-O-W-N.
http://singularityhub.com/2013/08/16/drone-climbs-up-sewer-pipes-to-perform-surveillance-deliver-goods/
Subject: SEWER DRONES 
Tue Sep 10, 2013 9:09 pm
