I'll be bringing the GPS, the full chart, and a snapshot of the last 1/8 of a mile. I'm finding tools to export into CSV format - just have to turn it back into a speed chart.

A PI lawyer told me that in Virginia, if you plead guilty to a ticket (by paying and sending it in), it can be used in a civil suit later, but if you are acquitted, or take it to trial and found guilty, it's not admissible.

Doesn't matter. Money is secondary to him getting the conviction and points on his license. He shouldn't be allowed to walk away with no consequences.