CORDY, J.
The Commonwealth appeals from an order of a Superior Court judge dismissing its petition to commit Wayne Chapman as a sexually dangerous person, filed pursuant to G. L. c. 123A, §§ 12-16 (2004 petition). The judge ruled that the 2004 petition represented an impermissible collateral attack on a 1991 judgment that Chapman was not a sexually dangerous person. The Commonwealth contends that collateral estoppel principles are inapplicable because its...
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