Obviously, at least one person on the security team provided location and schedule information to the potential shooter, or someone on his team. We still have rats and snakes in the cellar.
I wonder if the Secret Service uses dogs in their protection details, I’ve never seen one but don’t know the answer.
It would seem to me a couple of agents with dogs could easily sweep the perimeter and easily detect someone hiding, assuming you want to find people.
at least one person on the security team provided location and schedule information to the potential shooter, or someone on his team.
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Or the local (democrat?) sheriff whose office is 255 feet away. And who did not bother to investigate the perp’s parked vehicle for 12 hours.