My first thought was Ecstasy and my second was GBH. I'm still fixated on the blue Gatorade bottle found at the crime scene.
http://www.gdcada.org/statistics/ghb.htm
How is it used ?
In powder form, measuring a dose is fairly straightforward. On the street, it is usually sold as a liquid by the dose. In liquid form, GHB comes in a wide variety of concentrations with a single dose ranging from a few drops to a full glass. In some cities, GHB is put into water guns, and users buy it by the squirt. In other instances, candy, such as a lollipop, is dipped in GHB and sold.1