The main problem with trying to catch him is that the area he is probably hiding in is under the control of no government (despite what the lines on the map say) and is an area that is almost impossbile for the military to maneuver in. It is a tribal area, and anyone in that isn't a member of the tribes is known immmediately. It is also an area that has been used by smugglers for centuries, and is riddled with tunnels and caves.