The difference is scale. "You look a bit like a shoplifter from across the country" is not a productive use of a police officer's time, so will basically never

The difference is scale. "You look a bit like a shoplifter from across the country" is not a productive use of a police officer's time, so will basically never happen. Whereas the people in this article are going to get challenged, if not outright refused or arrested, in an increasing number of stores as this tech spreads.