[Quick1]

That depends on whether or not you are on private propery.

No, it doesn't. The grounds for your detainment must happen BEFORE the inquiry of the detainee. The store retains the right to ask him to leave their property, however.

The best idea is to stay off their property if they engage in this behavior.

A good idea, but most stores don't exactly advertise the fact that they check receipts. I like the idea people have had to immediately walk to the return counter when asked to show a receipt.

[AppyPappy]

This case is similar to what happened when I was a teen. A convenience store limited the number of teens in the store at one time. The teens argued he was discriminating. He argued it was his property and he was protecting it.

The one thing I remember is that teens would still go to the store. Even the ones making the most noise.