If it's not too late, your friend should check the law to make sure the ticket is valid. On one of french investigative report shows they brought up a case where a guy was ticketed for having put little blue lights on his car (the ones like when you change your windshield washer spray things for the one with the lights). The cop had said that blue lights were reserved to cop cars only. On the show they looked up the law and found out that as long as they aren't flashing, you can add whatever color lights you want on your car. I think when cops are having a bad day (donut diet) they get pretty creative.