As a store detective you operate actively with preventing theft. All the interferences will be reported to the police.
The store detective is working actively together with the store keeper to prevent theft from customers and also from staff. A common control is to check staff when leaving work and also check when the products are delivered to the store. The store detective also do secret tests by buying articles, in order to make sure that staff is using cash-register properly. As a store detective it is important to blend in and to work in a way that does not arise any suspicion of who you are.