so he could check and make sure my trailer registration was correct. It was funny. He pulled me over as I was in the right lane, I had passed someone a few minutes previous in the left lane. After the officer went to check my license, my son said questioning, "We werent in the left lane". He was learning to drive so he was confused. i just laughed and said, they are checking the trailor registration. When he came back h started asking about the trailer. Sometimes they aren't very good at hiding things. They will find a primary offense so they can check the secondary ones.