Could you get arrested for having weed in your system?

unless for medicinal purposes and you have prove of that it is 100% illegal

dumb freakin question

^^ This guys answer sucks. It is decriminalized in some states to carry up to an ounce of weed with you. This means that if a state trooper catches you with over and ounce it is a felony, but under and ounce it is about a $100 ticket.