If you make a hasty exit rather than stopping, you become a suspected shoplifter which triggers Shopkeeper's Privilege
Nonsense....
I worked as Loss Prevention for Longs Drugs in CA. Also, for what it's worth, I attended a full length POST academy in CA. Believe me, the first guy to try that move will wish he hadn't. Corporate rules not withstanding, trying to hurry as you exit a store does NOT give that storekeeper a reason to detain you. Can they? Sure. Citizens arrest, and that's exactly how the police will treat it, as an arrest requested by a private citizen. And then that same private citizen will have his day in court when the receipt is removed from his former customers pocket during the investigation, and the arrest turns out to be false imprisonment. I've also been there, done that. Walmart in Oregon and Best Buy in CA. Both times I was asked to show a receipt, and refused. In both cases, the cops showed up. In both cases, the store employee told the cops I wouldn't show a receipt. Both times, the police asked if they thought I was stealing, and if so, why? *crickets chirping*.....
A refusal to show a receipt does not mean one is a thief.
I don't show receipts. I'm an honest citizen, and I don't steal. If the store really has a theft problem, they need to hire somebody to make arrests of suspected shoplifters. Don't post a 65 year old guy at the door, and tell him to make me show a receipt, 'cause it ain't gonna happen. If a store employee approaches me, and can articulate to me a reason they think I may have stolen something, I'm willing to show my receipt.
Now, if a shop has a sign at the door where I enter, which states their right to do receipt checks upon exit, fine. I might go along, or I might not shop there. It's an arbitrary requirement, selectively enforced. Same thing if I hold a party, then require before leaving that people genuflect to me. Does it harm them? No, but it's sure as hell unusual, and unreasonable. If they refuse, can I call the cops?
Or, how about if I require guests to show receipts for items they have on their person when they leave? Fair?