I worked at my local Goodwill (they're split up by region). We kept a close eye on known shoplifters, but we couldn't say anything and even my boss couldn't say anything unless he literally saw them conceal the object then walk out of the store and never broke eye contact. They said the store could get sued if we stopped them and they had ditched the contraband in the moment we looked away.

I don't see why the stores discussed here should be treated differently. Someone needs to sue these surveillance stores until they stop automating false accusations.