USA TODAY is leading a national effort to obtain and publish disciplinary and misconduct records for thousands of police officers.

• Most misconduct involves routine infractions, but the records reveal tens of thousands of cases of serious misconduct and abuse. They include 22,924 investigations of officers using excessive force, 3,145 allegations of rape, child molestation and other sexual misconduct and 2,307 cases of domestic violence by officers.
  
• Dishonesty is a frequent problem. The records document at least 2,227 instances of perjury, tampering with evidence or witnesses or falsifying reports. There were 418 reports of officers obstructing investigations, most often when they or someone they knew were targets.
  
• Less than 10% of officers in most police forces get investigated for misconduct. Yet some officers are consistently under investigation. Nearly 2,500 have been investigated on 10 or more charges. Twenty faced 100 or more allegations yet kept their badge for years.