Yes there is. In California it's governed by the Labor Code: Section 2863 states, “An employee who has any business to transact on his own account, similar to

Yes there is. In California it's governed by the Labor Code: Section 2863 states, “An employee who has any business to transact on his own account, similar to that entrusted to him by his employer, shall always give the preference to the business of the employer.” There are other aspects to it as well, but that's the nut.