Urine Analysis, Hair tests, Spinal tap, and checking for dilation of the pupils are a few ways.
Your pupils DO NOT dilate from getting high off marijuana. However your eyes will become red.
red, baggy, glossy eyes. not thinking straight. saying uhhh... a lot. lol
laughing a lot. saying random things. orrr you can be really quiet and to themselves. depends on the person and how much is...
Easy! Get a urine test suddenly and make them pee in a cup. test it. Or, if your trying to secretly find out, smell their clothes(i know it's kinda creepy but you can't mistake that smell!). you...
if its affecting their everyday life then research rehab. otherwise be cool. the drug can never killl you by using to much. its not like cocaine or acid.
(Advisory: If this is to be locked, the warning about the illegality of the substance, and the need for a physician and attorney to advise you if you are an exception to the law, should remain....