Massachusetts General Laws Part III. Courts, Judicial Officers and Proceedings in Civil Cases (Ch. 211-262) Ch. 218, § 14

Clerks and assistant clerks of district courts may sign process issued by the said courts, and court records, documents or other legal papers, or copies thereof, relating to criminal, delinquent, wayward and neglected cases made or issued by such clerks or assistant clerks in conformity with law, except search warrants and process authorizing arrests or commitments, by imprinting thereon a facsimile or electronic rendering of the signature of the clerk or assistant clerk; and such signatures shall have the same validity as their written signatures.

Complaints for violations of the parking law, brought under section twenty A or section twenty C of chapter ninety,  1 may be signed by the complainant by imprinting thereon a facsimile or electronic rendering of his signature. Such signature shall have the same validity as his written signature.