Also depending on you state if you truck is serviced and the dealer/service folks find traces they must report it.
This happened to me. I buy red for my hay tractor, but also used the same cans for travel. I thought it was empty, but there was a trace left that showed up on the fuel filter. Dealer was nice about it as I had a second full fuel can in the bed. It looked perfectly good for taxed fuel. They tested it and it showed positive for the dye. Lesson learned. I bought two new cans for my trips and marked the others.