Of course, most people are honest, but you can take measures to ensure that all of your bar employees are honest. Here is a list of things you can do to head off potential problems and handle them when they begin.
Check employee bags and packages when coming in and going out.
Conduct detailed weekly inventories.
Do not count out tips from the register at night.
Establish a "no drinking or drugs" policy for all employees.
Have spotters and mystery shoppers pull surprise inspections on a fairly regular basis.
Dismiss any employee who is caught stealing or breaking a law, with no second chances.
Install security cameras.
Keep storage rooms locked.
Insist that non-sales must still have receipts.
Thoroughly count your register drawers every night.
Designate one door for entering and leaving.