[Pablo64]

So I guess it would all boil down to what a court or jury would consider "reasonable", i.e., reasonable suspicion, reasonable time of detention, etc.

Of course, my definition of reasonable would not include anything that is of even the slightest inconvenience for me. ;-)

[1rudeboy]

It's a little more complicated than that, in the sense that each State has its own Shopkeeper's Privilege Statute, but essentially you nailed it.