You may need to seek legal help with this to give you a little bit of clout behind the matter.  The state has leverage here and they have power beyond belief.  Here is the general rule on garnishment for Maryland:"Disposable wages are defined as the amount of wages that remain after mandatory deductions required by law, plus medical insurance payments. The amount exempt is the greater of 75% of disposable wages, or $145 times the number of weeks in which the wages were earned (in Caroline, Kent, Queen Anne's and Worcester 30 times the federal minimum hourly wages due under the Fair labor Standards Act.) (Annotated Code of Maryland, Commercial Law Article Sec. 15-601.1). A judgment creditors report must be sent each month to the debtor and employer. "Good luck to you.