Driving east on US 166 in Kansas in a rental car with Missouri plates, the rental having become necessary when I broke a serpentine belt in my vehicle in Missouri on my way to the Wichita meet that year and the repair shop didn't have one in stock. I got behind a SUV doing the speed limit and passed it. There were no markings on the back, but it was a deputy sheriff's vehicle with a very low-profile light bar on top. As soon as I pulled back in front of him, he hit the lights. He ran my information, and come to find out he was a native of Winchester, Ky., where I'd lived for seven years, and was familiar with my home area. He told me that the insurance information I'd given him, provided by the rental company, was expired. He called the company and read them the riot act, telling them that he could have taken their customer to jail for not having the proper documentation, but he wasn't going to do that. I fully expected (and deserved) a ticket, but he didn't give me one. He was very friendly and cordial, especially when I explained the circumstances on why I was driving a rental vehicle.
I don't know if he was running radar or not. I'd left my radar detector in my vehicle back in Springfield because I didn't have anything to use to mount it to the windshield or visor. (I'd bought a mount that permanently attaches to the rear-view mirror and it doesn't come off the mirror easily.) If he's been running radar, my V1 would have picked up on it when I got behind him and I wouldn't have passed -- and I certainly wouldn't have if the vehicle had any markings on the back to denote it was a police car. It did have markings on the side, and I knew as soon as I was passing him and saw the decals that I'd be pulled over, even if I braked and pulled back in behind him.