20 year report here:
This is an excellent publication on police corruption and ethics.
This work aims to provide a common level of knowledge and understanding of police integrity and corruption, its causes and the efficacy of strategies for its prevention. Other issues of relevance include the links between integrity (and lapses in it) and the development of corruption, and strategies for instilling organisational values and integrity in staff. It is not an aim of this report to provide an assessment of the current extent or nature of police corruption in the United Kingdom. It is hoped this work will provide an essential base for the development of robust prevention strategies in the longer term.
By definition, a literature review is necessarily historical and shaped by available material. The review covers the main English language literature on the issues of police corruption and police ethics over the past 20 years. It includes the sociological and criminological literature, together with a review of the main ‘official inquiries’ from the United States and Australia.
The city of Chicago on Wednesday released more than 6,500 pages of a long-secret Inspector General’s report on the 2014 shooting of Laquan McDonald, making public for the first time hundreds of pages detailing…
— Read on www.nbcchicago.com/news/local/Read-the-Full-IG-Report-on-the-Laquan-McDonald-Shooting-562640671.html