Articles about police complaints for a lit review?
I found these articles about measuring the quality of service of a police department:


  Chen, Chien Min et al. 2013. The police service quality in rural
  Taiwan. Policing: An International Journal of Police Strategies &amp;
  Management 37 no. 3:521-542.
  
  Editorial Desk. 1983. A Better Report Card for the Police. The New
  York Times (Late City Final Edition), February 11.
  
  Slothower, Mary, Peter Neyroud, Lawrence W. Sherman. 2015. Tracking
  Quality of Police Actions in a Victim Contact Program: A Case Study of
  Training, Tracking, and Feedback (TTF) in Evidence-Based Policing.
  International Criminal Justice Review 25 no. 1:98-116.


Then I found this about productivity and trust.Sort of has to do with supply side, and a little about the quality of service.


  Brown, Sarah et al. 2015. Employee trust and workplace performance.
  Journal of Economic Behavior &amp; Organization 116 (August): 361-378.