Plughole

“A team at the University of Sheffield has shown that ‘tampon tests’ can be used to track down which houses sewage is coming from at river locations where a problem has been identified.” (http://www.theguardian.com/environment/2015/mar/31/tampon-tests-could-be-used-to-track-sewage-in-rivers)

This will help plug the enforcement loophole of unsanitary crime.