If you have only handful of employees, you need an employee handbook. Handbooks are the go-to tool for employer-employee conflict resolution. In a well-made employee handbook, everyone's expectations and obligations are spelled out clearly.
And this article from EHS Today shows how to make your own in four simple steps. A brief excerpt from Step #2 states:
The only constant is change. That is never truer than when it comes to local, state, and federal laws. Legislators are always making changes at the behest of their constituents and in accordance with changing times. You can expect the labor laws to change dramatically while you’re in business.