Recently, few issues have been debated more often and more vigorously than the use of torture - especially waterboarding - to extract information from suspected terrorists. But this is not the first time Americans have debated the issue. In the first third of the last century, police resort to torture was hotly disputed. One police interrogation manual from 1940 stated that torture should never be used because it does not produce the truth. How much progress have we made in the last two-thirds of a century?