Is It Legal To Detain A Shoplifter?

Is It Legal To Detain A Shoplifter? Under California law, the “shopkeeper’s privilege law” says that shopkeepers, or store owners or merchants, may detain a customer if they have probable cause / reasonable grounds to believe that the shopper is guilty of shoplifting (per Penal Code 459.5). Can a store employee physically detain a shoplifter?