Contracts between police and city authorities, leaked after hackers breached the website of the country's biggest law enforcement union, contain guarantees that disciplinary records and complaints made against officers are kept secret or even destroyed. A Guardian analysis of dozens of contracts obtained from the servers of the Fraternal Order of Police (FOP) found that more than a third featured clauses allowing - and often mandating - the destruction of records of civilian complaints, departmental investigations, or disciplinary actions. 30% of the 67 leaked police contracts, which were struck between cities and police unions, included provisions barring public access to records of past civilian complaints, departmental investigations, and disciplinary actions. The leaked contracts became publicly accessible ... when hackers breached the Fraternal Order of Police's website and put around 2.5GB worth of its files online. These provide a glimpse into the influence of police unions, which Black Lives Matter activists have accused of impeding misconduct investigations. The documents date back almost two decades. Many contain numerous recurring clauses that slow down misconduct investigations. [Many] substantiated use-of-force allegations fail even to garner penalties as high as a reprimand with suspension. In cases between 2010 and 2015 in which the NYPD's office of the inspector general confirmed that officers had used unwarranted excessive force, officers were given no discipline 35.6% of the time.