Do you know where the person banks? If yes, go to court and get an information subpoena and restraining notice (there are other needed forms). You might want to let a sheriff or marshall or collections attorney try to collect.
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There are many options, but in general the more information you have on your debtor, the better. There are wage garnishments, bank seizures, and other devices, but they are difficult to do properly without knowing the procedure to collect.
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