State law addresses hearing screening.
105 Code of Massachusetts Regulations 200.400 Vision and Hearing Screenings
(C) The school committee or board of health shall cause the hearing of each student in the public schools to be screened in the year of school entry and annually through grade 3 (or by age nine in the case of ungraded classrooms), once in grades 6 through 8 (ages 12 through 14 in the case of ungraded classrooms), and once in grades 9 through 12 (ages 15 through 18 in the case of ungraded classrooms). The hearing of each student shall be tested by means-of some form of discrete frequency hearing test such as the Massachusetts Hearing Test or comparable method approved by the Department of Public Health.
Responsibilities of School Health Services
"Oversee the mandated screening programs consistent with Massachusetts General Law. Under M.G.L.c.71 s.57, these include Body Mass Index (BMI),vision, hearing and postural screenings." - I checked the law, this is for every student at request of the parent