Costco, Sams Club and the like have you sign a contract for membership that requires you to show the receipt upon exit. Walmart, Target, etc. are governed by th

Costco, Sams Club and the like have you sign a contract for membership that requires you to show the receipt upon exit. Walmart, Target, etc. are governed by the state, county, and city laws. Most states allow you to ignore them and keep walking unless the theft prevention is activated.