A hidden video of an employee seen stealing can be solid evidence. Hire Right and you greatly reduce the potential for theft. It is permissible to do a credit check before hiring for sensitive positions though it is advisable to get permission first. If all references offer a 'no comment' on an employee's performance understand that the employee probably had some problems and these problems may have involved theft. Track Inventories and Supplies.
Careful monitoring can point out problem areas.
Most theft goes unnoticed with little or no monitoring. The biggest theft I see consistently is time. In my opinion this is the biggest area of theft in business. Be Creative in your search for theft, pilferage and embezzlement. Avoid the Small Stuff.