I would like a wearable device that could record all of my interactions with police for $300. The device would ideally have shock-protection to withstand taser

I would like a wearable device that could record all of my interactions with police for $300. The device would ideally have shock-protection to withstand tasering and multiple nightstick beatings. You know...just in case ;) We could sell hundreds of thousands of those in the US alone ;) We could even upsell people on insurance: a "Personal Pig Protection Policy." It's a startup! Who's with me? Seriously, though: I was once pulled over by an unmarked police car in a rural area. The cop turned his brights on and then got into my back seat on the passenger side...without saying anything at all. It scared the bejeesus out of me. He completly freaked out in my car - waving his hands and screaming - because he thought that I had almost hit him. (He was parked 'mostly' on the shoulder of the road. Out in the boondocks. With his lights completely off. At 3am. To catch speeders. I was going to work. On the highway. And I got within 50 foot of his car before I saw his cruiser's ass hanging out into the lane. Silly me.) Naturally, the video of this incident in his cruiser had been wiped "that same night." I would have loved to have video of the incident when I was disputing the ticket. And I also wish that was my worst police experience.