This recapitulates many arguments made by Georgetown law's David Luban in the excellent 2005 essay "Liberalism Torture and the Ticking Bomb" which we should all go read right now :)
http://scholarship.law.georgetown.edu/cgi/viewcontent.cgi?ar...
http://scholarship.law.georgetown.edu/cgi/viewcontent.cgi?ar...
I think you may also like the essay {PDF warning} http://www.cgu.edu/pdffiles/sbos/costanzo_effects_of_interro....