So I was watching COPS this morning and a cop pulled over a lady for something. Can't remember. Anyways, when he gets up to her window, he notices a marijuana pipe and asks her to step out of the car. He talks to her for a bit before searching some more and asks her if she is stoned. She tells him that she's not. Then, he says, "Ok I'm going to get you to tilt your head back and close your eyes." She does that and then he looks at her face for a bit and says, "C'mon girl! You're so stoned. Why are you lying to me?" I thought that to be an odd test... Is there anyway he could have determined she was high by her doing that or was he just making shit up?