99- 650 C.M.R. ch. 2, § 2-1
The Authority shall weigh each boxer using scales furnished by the Authority. Scales shall have a maximum deviation of 8 ounces. Both boxers in a scheduled competition must weigh in on the same scales. The Authority may require appropriate testing of the scales prior to the weigh-in to ensure that the weights of boxers comply with these rules. If boxers' weights do not so comply, the Authority shall notify the promoter, and the contest shall not take place.
All weigh-ins must occur with an Authority member or agent of the Authority and the promoter or an agent of the promoter present. All weigh-ins must occur at a time and place chosen by the promoter and approved by the Authority. Once a weigh-in begins, the scales shall not be moved until all boxers have been weighed and the weigh-in is otherwise complete. Male boxers shall weigh in wearing no more than boxing trunks.
99- 650 C.M.R. ch. 2, § 2-1