What is the biggest problem facing police in the USA today?

Detailed description of the problem. Why is this the #1 problem? (More important than any other at the this time.) Related issues. Explain how this does or could affect a police agency (directly/indirectly). Who’s responsible? (The major players.) What is the history of this problem? Is it something new or has it been a problem for a long period time? What’s been done in the past, if anything? Why did those efforts work or not work? What is the long-term strategy for addressing the issue? Final recommendations. Why should we care? (Police chiefs, citizens, government officials, etc.) Whatever information you believe would be of interest.