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I’m neither a cop nor a secret service agent, but I would expect that they cooperate to some degree at least on these events. Doesn’t even need to be much, just stand a cop with a radio next to an agent with a radio somewhere so they can immediately pass on information to each other and relay it to their respective colleagues. Armed shooter sighted on roof seems like a worthy bit of intel to wanna pass along.
If they don’t have the means to relay information to each other… that seems rather shortsighted on both sides.
How about “ran out of fuel so ditched it on the side of the road and a farmer towed it away” ones? Unless that’s just considered “captured”