This study assessed the influence on Not Guilty By Reason of Insanity evaluations of demographic and other characteristics of examiners and defendants. The clinical opinion regarding sanity was measured with the examiner and defendant variables. The data base included all felony defendants who had evaluations (466) done and their examiners in a four-year period in one county in Ohio. Results showed clinical opinion was affected by the defendant's age and the examiner's length of professional experience or, in some cases, length of forensic experience. Acknowledgement, notes, references, and tables. (Author abstract)