The Limits to Spiked Drink Detectors, from science journals:

Jodi E. Meyers and Jose R. Almirall (2004) “A Study of the Effectiveness of Commercially Available Drink Test Coasters for the Detection of ‘Date Rape’ Drugs in Beverages.” Journal of Analytical Toxicology, Vol. 28, November/December.

Dale W. Quest and Joanne Horsley (2007) “Field-Test of a Date-Rape Drug Detection Device.” Journal of Analytical Toxicology, Vol. 31, July/August.

Beynon CM, Sumnall HR, McVeigh J, Cole JC, Bellis MA. (2006) “The ability of two commercially available quick test kits to detect drug-facilitated sexual assault drugs in beverages,” Addiction, Oct; 101(10):1413-20.

Page, N.A., Paganelli, M., Boje, K. M. K., & Fung, H.-L. (2007). An Interactive Lesson in Acid/Base and Pro-Drug Chemistry Using Sodium Gamma-Hydroxybutyrate and Commercial Test Coasters. American Journal of Pharmaceutical Education, 71(3), 54.