This happened to a young man in the town next to us. He was right out of high school and he was taking he was taking his savings and the money his grandfather gave him (about $15K total) to buy some used cars at the auto auction in Shreveport, LA so he could start a car lot.
He was pulled over and of course, an 18 year old in a 'hoopty car' was suspicious enough to get searched and with that much cash, it was seized. He had to spend about $4K of his own money on lawyers to prove the $15K was his even though he didn't even receive a ticket, it was just suspicious based on the police officer's opinion.