Illegal search for suspected shoplifting?

My wife and i were shopping. She had a list she kept pulling out of her hoodie pocket. Another customer informed the cashier she saw her put stuff in her pocket. We got what we needed and checked out. We headed towards the door to leave and there was a cop there. We didn't think anything about it until he said i need to talk to you. So i moved away from the door and he then grabed my wrist forcefully and said dont even think about it. Never left the store. We then got taken to the office. I was searched and cleared. The cop didnt want to search her even though she was the one seen. She said go ahead search me too. We were then sent on our way without an apology.