I find it difficult to believe you couldn't replace this person with the current high unemployment level. It does rather sound as if you have a private agenda here which you are not, for some reason able to share with us for not getting rid of the individual concerned. How far are you going to let this run before getting the police involved? When you family business in bankrupted and all the other innocent employees have lost their jobs? Installing CCTV is not enough. Get some legal advice about installing a CCTV and your employment procedures for dismissing staff before you take the next step but I think you need to report these thefts to the police. Also. change the locks to your premises and don't give a new key to the suspect and if appropriate consider getting a Smartwater kit and security mark your stock so that it can be traced back to your store. Call your staff in one by one, with the suspect first, tell them about the thefts, watch for their reaction, and ask them if they know anything about them. Tell them that the police have already been notified. This may possibly force the thief to make a confession if they think is law is likely to close in on them. Do you know if any of your staff are facing financial difficulties at home with a partner being made redundant, debts building up, etc? This could possibly give you a clue as to who might be taking the money.