I used an off the shelf Bell helmet. I repainted it from all black to black and white. It had snaps for a visor that was attached. I ground those off, filled and sanded the holes before painting and after paint I added the silver band and buttons, a correct visor from a different style officer's helmet and the winged police badge from a police supply catalog. It now looks to be as close to screen accurate helmet as you could find. If I ever get brave enough to try uploading pictures,I may do just that. Hard to find correct patches since only traffic cops wear those in LA. I have one, need a second, and may have to have an embroidery shop duplicate it. The rest of my costume is accurate as possible including a fiberglass Berretta and Chrome bullet hits front and back. I do have to replace my belt gear eventually with smooth leather instead of the basketweave style. Most people at cons haven't noticed. I also need to find an old Motorola radio. I have a police scanner in a holster now which suffices until I do. Good luck on your quest!