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Offences Against the Peace, § 3780. Carrying Concealed Weapons, How Punished. Forfeiture and Sale of Weapons. If any person carry about his person, hid from common observation, any pistol, dirk, bowie-knife, razor, slung-shot, or any weapon of the like kind, he shall be fined not less than twenty nor more than one hundred dollars, and such pistol, dirk, bowie-knife, razor, slung-shot, or any weapon of the like kind, shall be forfeited to the commonwealth and may be seized by an officer as forfeited; and upon the conviction of the offender the same shall be sold and the proceeds accounted for and paid over as provided in section twenty-one hundred and ninety: Provided, that this section shall not apply to any police officer, town or city sergeant, constable, sheriff, conservator of the peace, or collecting officer, while in the discharge of his official duty.