The research used information from the hospital record. The men included 35 violent offenders and 32 nonviolent offenders, based on all charges and prior convictions. The violent offenders were those charged with assault, robbery, sexual assault, and all degrees of homicide. Nonviolent offenders were those charged with breaking and entering, uttering threats, and fraud. The analysis considered the ability of two-point MMPI code types (4-3 and 4-8/8-4) to distinguish between violent and nonviolent offenders. Results revealed that neither of these commonly used codes successfully distinguished between violent and nonviolent offenders. Thus, these MMPI codes types, when used alone, are far too unreliable for use in individual assessment. Tables and 10 references (Author summary modified)