It's fake! The video is real, but the presentation is fake.
Consider the following questions....
Q. Why is the voice of the helicopter reporter the same regardless of where in the country the video was shot?
A. It's fake. The reporter is sitting in a studio watching the video years after it was shot. It's called a voice-over.
Q. How is it we can hear the sirens, squeeling wheels and crashes from the helicopters?
A. We can't! They have a good foley artist. That's a sound effects guy. Like the reporters voice, the sound is added in the studio as part of the production of the TV show.
Q. How do they make time go backwards?!?
A. Watch the clocks on the dashcam videos. Time moves backwards. Why? Because the video is heavily edited to make the video appear more exciting.
This show implies that what we are seeing is how the incident happened. While the video is real, we aren't viewing things as they happened. We are seeing it the way the producers want us to see it.