It currently has about 1.2 million subscribers, with about 600 videos.
The channel basically shows police bodycam footage from various US law enforcement agencies, mostly local police/sheriff departments. The videos are not edited, other than to show perspectives from different officers at the same scene, and etc. There are some footage taken by police cruiser dashcam and also cameras mounted on police helicopters. Most are 10 - 30 minutes long. After watching some on the channel, you might even think some of the videos are too boring. But you know both good/bad are included.
Some of the footage show police beating on already arrested suspect, letting loose K9 dog on handcuffed suspect, police (I believe Chicago PD) planting fake drug evidence, swatting, etc. BUT, such cases are rare among the nearly 600 videos uploaded onto the channel so far.
Many videos do include active shooting incidents (some justified, some not) and might be a bit intense. But this channel is a really unique window into what Police encounter everyday. I highly recommend it.