Buy an old,out of commission police badge off Ebay, pin it to your seatbelt in plain view. Make up bullshit story about grandfather being on the force for years, that was his badge and he told you to always keep it there, just for this occasion. My buddy has gotten out of every ticket/stop since doing this..except his grandfather was a cop, not that have any way of verifying it. Also keep trash from your car and dump it in there if your going to do a big pickup, cops don't like digging through nasty trash, it can deter a search sometimes. I knew one guy that had a car just for doing pickups, it was an older plain looking Honda that he kept old food wrappers, empty coke cans, dirty rags, etc in so it was a F'ing cespool, there was grass and other plants growing in the carpet, you would literally gag if he left it closed up too long. He used to pick up 10lbs at a time and never once had a cop even want to look in that car when he got stopped. He played the role well..put on a dirty wife beater, sweats,,make himself look like a slob of a guy..