If you remain in any doubt about whether theft may be diminishing your hard earned profits at you bar check consider this: Bartenders write books that show you how to scam from your employer! Clearly the level of dishonestly that being displayed here is unusual but the combination of alcohol, cash and customers that are actively encouraging your bartenders to 'top that one up a little more' is a dangerous combination.
Clearly it's important to trust your employees but it's also important to verify that trust. The easiest way to do that is to accurately compare the product you pour with the product which is rung into your POS system.
Here's the book I'm talking about: http://www.amazon.com/How-Burn-Down-House-Bartenders/dp/0974867705
Video - Bar-i product demo
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