At my Walmart the lady at the out door looks at your receipt and glances at what you bought. I suspect they subject suspicious character to much closer scrutiny than people who are look respectable. That’s not always a good idea; the first step to being a successful criminal is not to look like one.
I suspect the receipt checkers focus on mild, respectable-looking people who are unlikely to harangue them or punch them out. "Yes boss, I checked 17 church ladies, 2 nurses and a grandpa the last 20 minutes."
At my Walmart the lady at the out door looks at your receipt and glances at what you bought.
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At my local WM the Greeter will check a receipt only if the customer has unbagged items in the cart. Thieves who catch on to that simply bring WM bags in with them!