@hdpeterson75,
But your tags
were expired right? So what difference does it make when he saw them?
He may have driven by earlier and noted the expiration, so, when you decided to drive, it was a chip shot for him. He didn't need to lie in wait, a proposition most judges would find unlikely.
The solution?
Pay for the tags. Go to court. And, beg for mercy. In Washington state, that will usually cut you enough slack for reduced or zero fine.