Crowd control

Astroworld Was A Crowd Control Nightmare. Here’s What Could Have Prevented It.

As authorities work to find out what caused the deadly crush at Travis Scott's Houston concert, safety experts point to the importance of crowd management.
By 

Feds Sought ‘Heat Ray’ To Clear D.C. Protesters For Trump Photo Opp: Whistleblower

The system induces an extreme burning sensation using a directed beam of energy.
By AP