> FLSA prohibits public sector employees from volunteering, without compensation, to work additional time performing the same type of services or work for which they are employed. For example, a police officer can properly be considered a volunteer, and need not be paid, for reading to school children at the municipal library. The same officer must be paid, however, and cannot be considered a volunteer, when directing traffic for a city-sponsored road race in the same municipality where the police officer is employed.

So I guess if you already have a position in another state school, you apparently can't take this one.

[1] https://www.wardandsmith.com/articles/wage-hour-law-voluntee...