Actually, it's the dumbass cops who DIDN'T test Zimmerman for drugs or do a decent investigation. Had they done so, they would have found out the following;
According to the report, prior to the shooting Zimmerman had been prescribed Adderall and Temazepam, medications that can cause side effects such as agitation and mood swings, but in fewer than 10 percent of patients. ABC News Exclusive
Funny how the Zimmerman zombies are all jerking off to the report that Martin had some THC in his system, but are either ignorant or indifferent to Zimmerman's condition at the time.
The responding officers must not have had sufficient probable cause to suspect Zimmerman was under the influence of any controlled substances.
They know what to look for.
Actually, they had to DO THEIR FREAKING JOB PROPERLY! They didn't, and that may well be a negative for the defense should this go to full trial. http://www.nytimes.com/2012/05/17/us/trayvon-martin-case-shadowed-by-police-missteps.html
Hell, I was DUI tested one night because my cold medicine made my pupils act like I was inebriated....when the deputy shined his light at me, my pupils didn't dilate with the light.
Which has NOTHING to do with a case involving a fatal shooting....totally different situations.
You DO realize that 'being prescribed' a drug and being 'under the influence' of a drug is 2 different things, right?!