DEA license as a relief vet

Are there any veterinarians that have a full time job but also do some relief work on the side for extra income? From my understanding you can only have one DEA license in a state and if you’re registered for your license at your primary place of work, are you allowed to get a secondary private DEA license that you can use for relief work? Just trying to figure out what is the best way to go about this as I am looking into picking up some extra shifts (this is for Texas btw).