Just been to the supermarket and used their Smart shopping system where you pick up a scanner ad use it to scan the items as you shop then check yourself out.
Good idea but it's a shoplifters paradise 
Forunately I'm an honest chap 
Was singled out for a random check today.
Must be random check week, we were on Monday. I have to say a random check that only checks if you've scanned the 5 items most visible in your trolley (as was what they did) is right up there with chocolate teapots for uselessness