Legal Question in Criminal Law in Kentucky

Ever been to Sam's Club? Sure they can. Granted, if you refused, as long as you've really paid for everything, it's not like they can charge you with shoplifting. Unless of course the cashier missed an item, which is why the door greeter's there checking receipts, to catch errors made by the cashiers. (Shoplifters usually don't just stick the stolen item in plain sight after having paid for a bunch of other stuff.) But it would be hard to prove you didn't intend to cross the point of sale with an item for which you didn't pay after refusing to have your receipt checked, so I don't recommend it.

Back a lifetime ago when I worked in retail (at a now-defunct computer superstore) our door greeters got "spiffed" (small bonuses) for catching receipt errors. It helped pad their minimum wage salaries, while eliminating costly merchandise shrink (losses). So be nice to your door greeters, whose names peel off their nametags in this fickle economy. You never know, they might catch an error that otherwise would have cost you extra money!