I'm not sure that possession of synthetic weed would even net one a charge in most states, would it? I'm pretty sure that kids are ordering it off the back pages of "High Times" magazine and through local five and dime convenience stores.
FWIW--I believe that Elam had over a quarter pound, almost five ounces. He also had what they referred to as "3 grams" of Oxycodone, which is the active ingredient in Percocet/OxyContin.
Edit: Here is a super informative article that I found on the subject. Seems like they're continuously changing up their chemical makeup and packaging in an attempt to beat the technicalities of the law, which has made some of the active ingredients illegal in some states. Here in PA, what's known as "spice" is perfectly legal and is sold in many places as incense.
Everything You Wanted to Know About Synthetic Marijuana but Were Afraid to Ask
And this one will blow your mind:
Is K2 illegal in Pennsylvania?