Back in 2009 there was a pretty big study that found "date rape drugs" were not as widespread as thought. Those drugs are easily detectable in urine. And the larger percentage of women who thought they were drugged did not have the drugs in their urine. More often the blood alcohol level was to blame for their symptoms of confusion, vomiting, etc.

I think this is a great invention, but I question its overall usefulness considering this study.