A very simple investigation with the ballistics of the round that killed her up against every gun assigned to any Capitol Cop in the building that day. And to take make it even simpler, a list of all the Capitol Cops that were in plain clothes that day, inside the building. Match the ballistics of the rounds in their duty pistols to the one in Ashli’s body.
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Unless Capital Police operate outside the bounds of control, police have to account for *any* discharge of their service weapons. There is a bullet in the body. There is a weapon minus one bullet. The DOJ/FBI has stated they won’t file charges or even announce the name of the cop who killed Babbit.
I believe the shooter was a congressman. Nicely dressed, in a suit, black mask, big shiny cuff links, shot her point blank in the face with no warning when he broke cover, people standing behind her - it was an unsafe shot and an intentional kill. A coo is trained not to do that. The shooter panicked. More likely to be a civilian.