The usefulness and validity of various personality tests in the selection of police officers has been recently considered. This study examines use of the MMPI to differentiate successfully between acceptable and unacceptable police candidates. An item analysis of the MMPI is presented, and five items which significantly differentiated the groups are combined in an index. The statistical errors of inference in a simulated selection procedure are examined with the use of Bayes theorem. The index has sufficient validity to warrant further investigation.
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