No, No, No. Y'all don't understand. This is a good tactic, and it works. She was just unlucky and none of the cool cops were working that day. She only gave them $3, because they jack all of their weed from people who actually pay for it, so they can afford to sell it ultra-cheap as it is 100% profit. This is a popular and well-known method to keep the evidence room clean from excess clutter.
There was actually a point in time where I would buy ALL of my weed and cocaine straight from the police station. Guns, too. They're always happy to unload a few of their older firearms for hella cheap, and at worst they only jam occasionally (they're Berettas, so if they jam up you can always just pistol-whip your enemy to death). I think the police are some good ol' boys, just some real stand-up citizens.