Do a little 'research' of your own into where the procedes go to in drug seizures. What percentage actually goes to the school system? You'd be shocked at how little goes anywhere, and how much illegally goes right back to the police department and the DEA.
Also, keep in mind, its a policy of 'guilty until proven innocent' in these cases. Law enforcement does what they want, when they want, with no fear of consequence.
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