Mass. Gen. Laws ch. 119 § 60
An adjudication of any child as a delinquent child under sections fifty-two to fifty-nine, inclusive, or any disposition thereunder of any child so adjudicated, or any evidence given in any case arising against any child under said sections fifty-two to fifty-nine, or any records in cases arising against any child under said sections fifty-two to fifty-nine shall not be received in evidence or used against such child for any purpose in any proceedings in any court except in subsequent delinquency or criminal proceedings against the same person; nor shall such adjudication or disposition or evidence operate to disqualify a child in any future examination, appointment, or application for public service under the government either of the commonwealth or of any political subdivision thereof; provided, however, that adjudication of delinquency by reason of the child having committed an offense against the commonwealth may be used for impeachment purposes in subsequent delinquency or criminal proceedings in the same manner and to the same extent as prior criminal convictions.
Mass. Gen. Laws ch. 119, § 60