If you're NOT contending that Trayvon Martin was high on the night he was killed - and you don't want to be lumped in with those saying he deserved to die because he used drugs on other occasions - what IS the relevance of whether he was going to drink his Arizona straight or procure codeine cough syrup later on?

for the case or overall?

For the case, basically nothing. I have already said there's good reason it wasn't admitted.

Overall? There's a reason people want to cast Martin as a good kid who got chased down by a vigilante. There's a reason to believe that's not really true.