Editor's note: Former FBI Agent Brad Garrett is an ABC News consultant and regular contributor to the Blotter.
At 8:30 any given weekday morning in New York City, an estimated five million people are riding the city's subway system. They are a prime and vulnerable target.
For the FBI and the New York police department, it is a nightmare scenario that agents and detectives have played out in their planning.
Terrorists bent on destruction could enter nine of the city's 425 subway stations...Full Story