There are countless videos out there of 2,3 even 4 or more cops struggling to subdue a resisting suspect. In most of these videos, the officers are using strikes and baton hits to try to bring the suspect under control and fail miserably and embarrassingly. This can be attributed to police officers being wholly untrained in grappling.
On the flip slide, here’s a video of what it looks like when a police officer has trained Jiu-Jitsu and can easily subdue and control a suspect.