Maryland Statutes
Part III - Child and Spousal Support -- Earnings Withholding
Section 10-137 - Withholding in Case of Out-of-State Obligor or Employer

In the case of an out-of-state obligor or out-of-state employer, the support enforcement agency shall, upon receipt of a request for service of an earnings withholding on the accrual of 30 days’ support arrears, send to the appropriate state agency or court a request for earnings withholding and any information and fees required by that state to process the request.