To test grossly for brain injury, a simple structured interview was administered to 129 felons in the Protective Custody and Segregation Unit of a large midwestern prison. To assess compliance with prison rules, disciplinary tickets accrued per day of stay were counted for 41 reported head injury (RHI) and 41 reported no head injury (NI) residents. The RHI and NI groups averaged 0.2132 and 0.1373 disciplinary tickets per day, respectively. A t-test supported the hypothesis of differences in disciplinary ticket receipt frequency between the two groups. RHI residents were involved in disciplinary infractions nearly twice as frequently as NI residents. The study findings have some important implications for inmate rehabilitation and prison management, although the authors indicate a simple interview must be used with caution. 27 references and 2 tables