A few months ago someone at Sam's Club walked out with 6 big screen tvs. Went to the self checkout but forgot to ring it up.

They got stopped in the parking lot so now when you self check it has to be double checked by the clerk standing there and near the exit.
Last week someone tried to steal meat from the local grocer so now every receipt is checked when you leave.
I never use the self checkout. I always have too much in my cart. Last week the manager called me over to the self checkout and did my whole purchase. That was very nice of her.
But steal ? No. Not even if I were starving. It's not worth going to jail.