We can kill them on sight. We can torture them, starve them, deny them medical care, all the rest of that stuff. The only things that have any bearing on the treatment of bin Laden, if caught, or any of his ilk, are the rules and regulations of the US Military. If he is caught on US soil, by US law enforcement officers, sure, he would be required to be read his rights or whatever the statutory requirements are for criminal arrests, but military personnel are NOT law enforcement officers (a distinction made legal by posse commitatus, and prisoners they take are presumed to be enemy combatants. Now it may be that the administration or Congress, exercising their Constitutional rights and obligations to command and make rules for the military, respectively, may impose such requirements on the military for their own reasons or based on their judgment, but there is no Constitutional requirement that anything of that sort is required.