Mass. Gen. Laws ch. 124, § 9: Monthly reports of arrests

Section 9. The police commissioner of Boston, city marshals or chiefs of police and every officer making an arrest in a town not having a city marshal or chief of police shall make monthly reports to the commissioner of the number of persons of each sex arrested in their several towns. Such reports shall be classified according to offences. An officer who refuses or neglects to make such report shall be punished by a fine of fifty dollars.