Actually I was talking politically. Pakistan and its President, Pervez Musharaf, have been a strong ally to the US in the war on terror. In order to not outrage the Pakistani population even more than they are at his (Musharaf's) support for the US led War on Terror he has forbidden the US to enter into Pakistani territory. Last time I checked Pakistan had successfully detonated a nuclear weapon. I would not want either Pakistan to turn into another Afghanistan or for the US to alienate Musharaf who may then side with OBL and Al Quaida (Not saying he would but he might)

So while the US is barred from chasing after OBL in the wilderness of Pakistan the Pakistani military is also not there to pursue him. This is a bad thing. Although I am willing to put money on it that the US does have some CIA and/or covert operations troops in Pakistan...as long as they are quiet. Although in such a role they would be limited in scope as to what they can do.