From Longman Dictionary of Contemporary Englishstore detectiveˈstore deˌtective noun [countable] SCPsomeone who is employed in a large shop to watch the customers and to stop them stealing
Examples from the Corpus
store detective• The highest award was £307,781 to a computer expert who injured his back helping a store detective stop a suspected shoplifter.• Ian Walker, prosecuting, said a store detective spotted Melia going into a cubicle to try the jeans on.• If I were a store detective, I'd never have let me out of there without a body search.• But one store detective isn't totally satisfied. 