Be it enacted by the Senate and House of Representatives
in General Court assembled, and by the authority of the same,
Chapter 140 of the General Laws is hereby amended by striking out section 121A, as appearing in the 1984 Official Edition, and inserting in place thereof the following section:-
Section 121A. A certificate by a ballistics expert of the firearms identification section of the department of public safety or of the city of Boston of the result of an examination made by him of an item furnished him by any police officer, signed and sworn to by such expert, shall be prima facie evidence of his findings as to whether or not the item furnished is a firearm, rifle, shotgun, machine gun, sawed off shotgun or ammunition, as defined by section one hundred and twenty-one, provided that in order to qualify as an expert under this section he shall have previously qualified as an expert in a court proceeding.