The prosecutor needs to lay it on and throw the book at this creep on top of animal cruelty. Having a firearm in a bar is illegal in Wyoming. Being drunk and having a firearm on you is illegal in Wyoming. Discharging a firearm when drunk is illegal in Wyoming. Discharging a firearm inside city limits is illegal in Wyoming. Take away his guns and hunting license for life too after he gets out of prison. He is one sick person.
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Just charge him for what he actually did. Don't unleash lawfare on the poor dunce.