This whole thing is worth watching (14 1/2 minutes) because it escalates as it goes, but if you're pressed for time, you can get a good idea by watching the first 4-5 minutes and the last 3-5.
It goes without saying that a person should not have to go through this. Most people will just comply because it is the path of least resistance. Admirably, this young woman is made of tougher stock.
Border check point officer vs young woman in car..'it's none of your business'(video)"I don't give you permission to inspect my car."
"Am I free to go, or am I being detained."
"I am a United States citizen, and you don't have the right to detain me."
"That's none of your business, am I free to go."