http://www.hup.harvard.edu/catalog.php?isbn=9780674743908
http://www.newsweek.com/2016/05/20/science-shows-torture-doe...
http://www.sciencemag.org/news/2017/01/scientists-trump-tort...
http://onlinelibrary.wiley.com/doi/10.1002/jip.1412/abstract
That is just a smattering of evidence for torture not working, and alternatives working. Can you similarly support your claim that, “...It [torture] probably does work” in the meantime? AFAIK no evidence of the success of torture exists, in the advertised contexts. Now, if you want to put on some show trials and can afford to lose half or more of your potential subjects at random, and you want to break them... sure. The USSR proved that much, but that is not how modern democracies use torture. Torture for the sake of interrogation does not work; the evidence to support that claim does exist.
I’d recommmend Torture and Democracy for the bibliography, never mind the excellent book.