[flutas]

> Combatting it is easy, you need to pay someone to stand at the door and check receipts.

Which won't help because they can't actually do anything, they have no right to actually see your receipt. They can't require it, they can't use it as probable cause, and they can't detain you.

Worst they can do is ban you from the premises.

Store's like Costco and Sam's Club can require it because it's part of your membership agreement.

[qbasic_forever]

Yes but it's still a deterrent for the vast majority of casual shoplifters. And if shoplifting is really such a horrible cost for these stores, why don't they go private and require shoppers to agree to a membership to shop inside (which includes an agreement to have your receipt checked)? There is no law that says stores have to be open to the general public.