Officer was parked east of the 65MPH sign (4-lanes begin ~100 feet before the sign) stated that he used radar to verify my speed was 50 in a 35 as I passed him. The speed limit apprently was 35 but I was following an instate pickup when we passed him at 35 and began to accelerate at where it began 4 lanes. The officer stated he used radar as I passed his location on the side of the road no indication was given by my radar detector.