This may be a bad hire as well. I don't know how the screening process varies in police departments. But, they might have missed something here. Officer Noor was also placed in a fast track, 7 month training program.
How the call was handled on scene is troubling:
They evidently decide to prowl down the alley in their cruiser. OK, but with guns already drawn?
Justine appears to have approached the drivers side of the cruiser from behind. Then, slaps the body of the cruiser making a noise that apparently startles Noor. I have a problem with the driver not seeing Justine approaching.
When Justine gets to the drivers side door Noor shoots her from the passenger side. A woman in woman PJ's is extremely non-threatening.
Body cameras were not on. "patrol car’s dashcam did not capture the pivotal moments, either".
[www.foxnews.com]

The investigation also needs to look into any political pressure placed on the police department to hire a Somali. While it's not a bad idea to hire a Somali. To hire an unqualified Somali just to have one is a very bad idea.