COWIN, J.
General Laws c. 123A, § 12 (b) (§ 12 [b]), permits the Commonwealth to file a petition to commit a person as a "sexually dangerous person" (SDP) only if the person is a "prisoner or youth in the custody of the department of youth services." This case requires that we decide whether, for purposes of § 12 (b), a person placed in custody pursuant to an unconstitutional statute is nevertheless a "prisoner" within the meaning...
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