An Exploratory Study of Two Decades of Promotional Testing in a Metropolitan Police Department

This study explored the career progression of police officers in a police department by examining the relation among 13 promotional tests at four ranks administered to 1,960 candidates over two decades. It was hypothesized that performance on promotional tests would be relatively stable during a law enforcement career, consistent with research demonstrating consistency in general mental ability. Overall, 28% of subjects retested one or more times and their retest scores on non-equivalent forms correlated about .40 with their initial scores. On average, subjects increased their score by one-fifth of a standard deviation by retesting. With some exceptions, candidate performance on promotional tests significantly correlated with tests for the immediately superior rank as well as tests for higher ranks as much as 15 years later. However, using multiple regression to predict performance on higher rank tests by combining lower rank tests was unsuccessful. Implications for the management of police promotional testing programs are discussed as well as suggestions for future research.