You will need a criminal attorney from the Maryland vicinity where he was arrested. Contact the local bar association in the county that the proceedings are taking place.
Herbert Tan, Esq.
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You need to hire an attorney who handles criminal defense in Maryland (preferably in the municipality/town where your son was arrested).
The Law Office of Brandon D. Walcott - 3 Harrys Court, Suite A, Ocean View, NJ - (609) 390-8888 - firstname.lastname@example.org. This is for general purposes only and does not constitute an attorney-client relationship. Contact an attorney licensed in your State for specific inquiries.
One possible option you son would have would be to have him show up for his first appearance and speak with the public defender who would be appointed. If he is not comfortable with the interaction with the public defender, he can then opt to switch to a privately retained attorney form the local Maryland area. This route would leave all options open for him.
On the other hand, retaining counsel prior to his first appearance would most likely allow him to have the matter handled for him without his ever having to appear in court at all.
You need to contact an attorney in Maryland, or a NJ attorney who is licensed to practice in Maryland. Give a call to the Maryland Bar Association at (410) 685-7878 or
(800) 492-1964 (http://www.msba.org/). They should be able to point you in the right direction.