It's worth reading up on Ketamine and its use medically before coming to conclusions based on this article. Notably:

1. EMTs are generally under the oversight of a head doctor and aren't supposed to take actions outside of what they're directed to do there. Even if instructed by a LEO

2. Ketamine is a relatively safe drug used for a variety of purposes. While it may calm down someone experiencing stress, it can also stabilize patients en-route to the hospital

While this situation may be a miscarriage of justice,we needn't throw the baby out with the bathwater.

Source: https://youtu.be/Dj4eBa7z03U

Also, the source here is a professional EMT and worth checking out for more points and more information. Prep Medic is awesome :-)