I'm just seeing "Moore says" "Humphrey claims" which doesn't imply either one is or isn't lying. Just that they're on equal ground at this point. I know for a fact people try to rope cops into situations like these, having witnessed it. But I also know for a fact cops do profile people, having also witnessed that.
I have myself pulled over in front of someone getting pulled over by a cop and watched to see what happened on two occasions now, the first one because I thought he was stopping me and then noticed he got really rude with a man of color who was driving behind me (I could hear him yelling from where I had stopped ahead of him). The second time because I noticed the cop aggressively riding someone's rear bumper and then flipped his lights on when there was no change in the driver's behavior. He pulled them over and I pulled over ahead of them (not behind him because that would probably cause some problems) he started in very rudely, looked up at me a couple times (now with my phone out) and let them go.