FP brought up a subject I hold close to my heart.
Job descriptions and SOP manuals.
I know a lot of y'all are rolling your eyes but they are incredibly helpful when you are having problems with staff.
They don't need to be pages and pages long.
Start small, have the employee read and sign.
They can be updated anytime you please....remove or add duties as you see fit.
Just have them sign and file it away.