Mandatory search of bags at exit of retail stores.
Can retail stores such as Fry's Electronics, BestBuy and Costco require all customers to submit to a bag search before exiting? If I show my receipt, but keep walking and refuse search of my bag, can they legally stop me? Can they legally refuse to serve me in the future because of this? In the case of Costco (a membership organization)can they legally revoke my membership card because of standing up for my constitutional rights?
Thanks for your help.