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"There is always that level of synergy between the protector and the protectee," he said.

Law enforcement consultant Roy Taylor, who has decades of experience coordinating security details for political events, said securing elevated positions around a venue is key to ensuring a protectee’s safety.

In addition to such publicly visible efforts, agents are often perched on rooftops with long guns when a protectee appears in public.

Secret Service, confirmed in a statement that the vials were addressed to “a Secret Service protectee,” adding that the vials were being tested.

The Secret Service, which provides protection to presidents and ex-presidents, released a statement warning the public of "short-term traffic implications due to protectee movements" in central Washington DC.