we don't want to allow a situation where we have unwielding crowd and access, so we have to control access in an environment like this. >> what's going -- i mean, you touched on this to some extent but what's going on behind the scenes that we're not seeing and that may surprise us? >> well, there's a lot of planning that goes into place, months and years for visits like this. there's the strategic and tactical planning, the pennsylvania state police and philadelphia police. there's the government planning, secret service, following up on every threat, every lead, determining who's made threats against the pope in the past or other government leaders in the past, who's recently incarcerated and let out of jail who's done this, who may have purchased a large amount of weapons or explosives. it all goes into play, evaluating intelligence behind the scenes. while everyone is watching the movement of the pope, there are people who are watching who might be interested in creating disruption or harming the pope. >> the people you just mentioned, people who may have been in jail, people who may h