Rethink that with this bit of information: Travyon's autopsy/toxicology report indicated that the little saint had THC in his system. Zimmerman mentions in the 911 call that he looks like he is on drugs, or something to that effect.
The fact that his toxicology report shows THC establishes that he was “high” as reported by Zimmerman is all that is needed to establish the fact. The fact he has a photo of pot plants shows that he has a propensity to smoke pot on other occasions. This is clearly not admissible under Rule 404 (B).
I have practiced criminal law for almost 30 years for both prosecution and defense and tried well over 100 criminal jury trials as. I have also served as a judge. No jury will see the pot photos in court.