If you can prove it, by all means file, and don't give them a break. But you should have ask for name and badge number because it is going to be really difficult at this stage to get that information. If you can remember the exact time and location of the stop, the type of vehicle, make and color, they were driving and with the help of a personal injury attorney you may be able to get that information. Will your passenger corroborate you testimony, and will her mother testify about her conversation? This is the stuff you need to move forward with a harassment suit, and even then it will be awfully hard to prove. For future reference always get a name, badge number, and the number of the vehicle they were driving. This is information they have to give you by law.