500
Some Walmart employees say customers are getting hostile at self-checkout — and they blame anti-theft tech
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
The experience in the US sounds entirely different than even in Canada.
I think it's an indication of the state of the US. People don't steal for fun. Maybe some do, but not in quantities that put an armoured security guard at checkout.