11 Aug 11
1 edit
http://www.gizmag.com/pocket-sized-date-rape-drug-detector/19479/?utm_source=Gizmag+Subscribers&utm_campaign=5d68c38dae-UA-2235360-4&utm_medium=email
This would let women know if they are about to drink a spiked drink. Optical property detected, probably refractive index but it doesn't say. Could also be polarization too. Or both.