Let me guess, nobody there is armed? That's probably also "corporate policy"?
I bet there are customers who are armed, as a matter of their own personal policy. When I go to the store, I am always carrying. Based on the local police reports where I live, the petty criminals who would steal shit at the grocery store are also usually armed (but illegally).
Not sure why you want armed guards at Safeway. No amount of groceries is worth anyone's life. And legally, Safeway cannot stop, search, or impede you -- certainly cannot lock you in -- unless they have probable cause. (Not just "reasonable articulable suspicions", but the higher legal burden.) For example, if they observed you concealing merchandise under your clothing. But are they going to risk violence over this? And if they are mistaken, and attempt to detain you, they are going to be facing civil and probably criminal charges. Their felonies will include: false imprisonment, assault, and battery, for starters. Shopkeeper laws are not going to shield them from that. And now you want them to pull a gun?
A better idea might be to have security cameras, and possibly follow them discretely out the door and snap some photos of them and their car plates. But even doing that might be too risky. What if they pull a gun because you are following them? You want to start a gun battle in front of your store? Over some tomatoes and beans? Just because they might be crazy, does that mean it's worth dying over? (Not to mention maybe killing bystanders.) You're nuts.
You could just call the police, and give them the security camera footage of them stealing, leaving the store, and maybe even getting in their car and driving away. You might even snap the license plate from a safe distance without them knowing you are doing it.
The police can do facial recognition on them, if their faces were caught anywhere along the way (assuming they have a driver's license or something). If they are wearing a hoodie and a mask, that's a problem.
Armed guards are very expensive, and a liability. You can be sure that the store has done the math.
If it's that bad in the location, maybe you should lock the ENTRANCE, and not let in sketchy people. Make them ID or face-scan in order to get in the store. You could even automate that.
Amazon scans everybody who walks into their grocery stores. And in the fancy stores (if they have any of those experiments still going), your every move is tracked by video-AI.
https://www.youtube.com/watch?...