If you’ve owned a business for more than a few minutes, you’ve had employees that cause problems, upset customers, and make trouble no matter where they go or what they do. They’re a real liability until you can let them go.
Your business is only as good as your worst employee. Customers might not remember when they received good service, but they’ll remember the time something went wrong. When you’ve got an employee who causes the problems through neglect, deceit, or other wrong-doing, you’ve got a risk on your hands.