[header] How to prevent employee theft at a restaurant [title] Compare stock to sales. [step] If you suspect employees are stealing food or drink, you should check to see if you have less stock than you should have given the volume of sales. If you consistently have low stock, it may indicate employee theft. 
[substeps] Discrepancies between stock and sales also may be evidence of poor serving or measuring techniques. It could also indicate that waste wasn't properly recorded.