Google is your friend.
Go ahead. Here are your declarations. Have at it. I’m sure we all look forward to being educated by the expert. We’ll wait.
-Evidence of the dart would be left behind.
-A fatal dose (of KCl) for someone like Arpiao would be about 2 teaspoons and would have to be administered into a vein to be effective.
-In order for KCl to be lethal in doses small enough to fit into this dart then it has to be injected intravenously.