I just smile and say “no thank you” and keep going. There’s nothing they can do unless they actually think you stole something and they don’t have the manpower to detain everyone who won’t stop for their receipt check.
Note though that doesn’t apply to Sam’s Club or Costco or similar, if you’re a “member” there you agreed to the checks.
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Saw a news story people about people getting arrested for at Wal-Mart for forgeting to scan one item (midwest.social)
youtu.be/tmoQxq2P7Y4?feature=shared
Eruption also works... 🌋 (slrpnk.net)