Quote Originally Posted by reality0
i dont get it... what exactly can/does it do?
I guess it picks up traces of drugs that would be left behind by people. For example if you've been smoking weed, it may pick up traces of it in perspiration or dead cells you left behind on surfaces or objects? It can't really pin point who it is specifically I guess. But it can lead to false accusations, questioning, and random drug tests in schools, or working environments.