PLEASE tell me you have a recording of this.
If not, PLEASE tell me you know the cops name.
A complaint will need to be handed in, if not mailed with a signature service.
It will be easy to do. Should take about an hour. But the cops name is extremely important. If you don't have it, the date and time, as well as a good description of the officer will be important.
Also, if no recording, before it slips your memory, you need to immediately write out as close as possible exactly what he said.
But hopefully this was recorded.