What is the test for a defendant to be held criminally responsible for a crime committed under the Mental Health Act?

Thus, "[w]hile it is true that * * * a person suffering from mental disease or defect * * * ought not to be held criminally responsible for that conduct and subjected to traditional punishment * * * the legislatively mandated consequences of a successful imposition of the defense equally reflect society's legitimate interest in knowing whether the defendant is and will continue to be a threat to himself or others" (People v. Lancaster, 69 N.Y.2d 20, 27, 511 N.Y.S.2d 559, 503 N.E.2d 990 [emphasis added]. Such an analysis necessarily involves an assessment of a defendant's future dangerousness.