Shaping police subculture

Police officers bring to their work a set of cultural predispositions, and police work has only a minor effect on these predispositions. How have these predispositions shaped police subculture?   The text book is: Caldero, Michael, and Crank, John, Police Ethics: The Corruption of the Noble Cause, (2018), Anderson Publishing, ISBN: 978-1437744559. The 4th Edition is listed in Amazon, ISBN-13: 978- 1138061170, ISBN-10: 1138061174