 
 <prompt> Wetin be di secondary locus wey succeed di original wahala of di mentee of Vollmer? Based on di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: In di United States, August Vollmer bring oda reforms, wey include education requirements for police officers. O.W. Wilson, wey be student of Vollmer, help reduce corruption and introduce professionalism for Wichita, Kansas, and later for Chicago Police Department. Strategies wey O.W. Wilson use include rotating officers from community to community to reduce their vulnerability to corruption, establishing of a non-partisan police board to help govern the police force, a strict merit system for promotions within the department, and an aggressive recruiting drive with higher police salaries to attract professionally qualified officers. During di professionalism era of policing, law enforcement agencies focus on dealing with felonies and other serious crime, instead of broader focus on crime prevention. 