e.g. checking your calendar/diary, looking through receipts or bank statements to work out where you likely were.
There's also a requirement that a request for information is sent within 14 days for minor incidents like speeding or red light violations, so it's not like you have to work out who was driving on a Tuesday morning three years ago.
I gave her the citation and she called the cop who issued the citation and asked him who was driving at the time. He answered that a man was driving, and she told him he issued the citation to her, a woman. Her first name is one letter away from a male first name, so I’m guessing the cop saw it and assumed it was me and not her.
He got frustrated and told her to go ahead and rip the citation up since he wrote it to the wrong driver, she told him she’d show up to court and the judge would instantly dismiss the ticket due to the officer pulling over a man and issuing the citation to a woman, so he canceled it. He didn’t want to look like a complete fool in front of a judge.
Not once did he ask who was actually driving because he knows she is never going to tell him and he can’t force her to reveal that it was me.
Note that not once did you mention that you were innocent.
Why would you presume GP was drunk?
Also, it's completely common and safe to drive slightly over the speed limit in some circumstances, and in many parts of the US it's exceedingly rare for people to drive below the speed limit as you suggest. In many places the tickets are essentially written more for not seeing the cop and slowing down than for actually doing 78 in a 65.
There really is no difference between "who drove through a red light" and "who scratched the bumper while parking" here - how do you currently solve the latter one?
Same as parking enforcement. Goes against the car, not an individual. So the financial responsibility will be assigned, but no punishment.
In short: https://upload.wikimedia.org/wikipedia/commons/thumb/e/ef/19...