So we find out (and it was reported) that Martin used marijuana at some point, but we don't know if Zimmerman drank, used pot, etc. Especially once invesigators learned that Zimmerman was on mood medications.
"The report also notes that Zimmerman had been prescribed mood medications Adderall and Temazepam before the shooting, ABC News reported. The doctor added that Zimmerman refused to go to the hospital the night of the shooting and added that it was “imperative” that he see his psychologist."