wage garnishment of an international water worker

Can the wages of an internatinal water worker be garnished? My husband works on the oil rigs across the world. He listened to his DUMB father and allowed one of his trucks to be repossed. My husband claims that he is protected under the Jones Act or Maritime Law or some other typ of law where his wages cannot be garnished for anything except child support or by the IRS. I need to know whether this is true or not. - Is this your question? Add additional information