It appears that this Police Lip Sync Battle Challenge started from an officer from Texas PD that posted a song that he lip synced and put out the challenge to all police departments.  The following are a collection of the departments that are competing in the challenge. I've listed as many as I could find on YouTube for your viewing pleasure.....Enjoy!

This first Video Explains how this challenge came about annotated in the video. 

Soddy-Daisy TN lip sync challenge

Norfolk Police Department Lip Sync Battle

Owensboro Police Department 2018 Lip Sync Challenge

Beaumont Police Lip Sync Battle

Sulphur Springs Police Department Lip Sync Challenge

Martinsville Police Lip Sync Challenge

Knoxville Police Lip Sync Challenge

St Helens Police Department Lip Sync Battle

Tyler-City Police Department Lip Sync Challenge

Pittsburg (Kansas) Lip Sync Challenge 2018

Monroe Police & Fire Departments Lip Sync Battle Challenge 

Boca Raton Police Lip Sync Battle

Gilbert, Arizona Police and Fire take on the Lip Sync Challenge

Arlington PDLip Sync Challenge

Fort Worth Police Department lip sync challenge

Dakota County Sheriff's Office Dance & Lip Sync Challenge

Apple Valley Police Lip Sync Challenge

Texas re-creates 'Flashdance' for viral lip sync challenge

Irving PD Lip Sync Challenge 2018

West Fargo Police - LipSync Challenge 2018

Clinton Police Department - Lip Sync Challenge

San Angelo Police Department lip-sync challenge

City of North Charleston Lip Sync Challenge

Oklahoma PD lip sync battle video

Ceader Hill Lip Sync Battle

City of Sherman SPD Lip Sync Challenge

Houston PD Lip Sync Challenge