Well said, David. I suspect the truth is more like John suggests. It was obvious he was going too fast, but the cop was unfortunate enough not to have anything solid to support it in court. Rather than doing the dishonest thing and claiming a radar measured speed, he did the marginally immature thing and got frustrated. "Dammit, I missed a speeder in a Porsche, but I can at least hassle him about those headlights!" Given that perspective, I don't know that I can blame him.
Now if somebody could only explain why I got pulled over on the NJ Turnpike for "having mismatched tail-lights."
Dan