with propane, with gas, with fertilizer that maybe we know now was inert, but perhaps wasn't known to this bomber and all this kind of m-88s and was actually detonated, in the bomber's mind. was allowed to get so close to the main center of this that i think that new york had a dry run here, don. and they're going to have to look and see what the procedures are, what could have prevented this. certainly, all due respect to the t-shirt vendors, to the police who did everything once they noticed that car, but i think the big question for new york city, how did this vehicle get so far in and pose such a danger to the people of new york and the world who were down in times square yesterday without anybody noticing until an m-80 goes off inside that vehicle? >> drew griffin of cnn's special investigations unit, drew, thank you very much for that. police are gathering their evidence, but the key is connecting it to the person