A defendant in a criminal prosecution, relying for his justification upon a license, appointment, admission to practice as an attorney at law, or authority, shall prove the same; and, until so proved, the presumption shall be that he is not so authorized.
Mass. Gen. Laws ch. 278, § 7
Burden to prove license or admission to practice as attorney at law
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.