Trump has said in an interview that he thinks water-boarding is an effective interrogation technique (source). This is why it is dangerous to elect an official who plays so fast and loose with evidence. Water-boarding and other 'enhanced interrogation techniques' were initiated by two private contractors, psychologists, who knew nothing about interrogation and who profited (or is it 'profiteered'?) considerably as a result (source). The problem is that these two idiot consultants decided that inducing 'learned helplessness' was the best way to approach extracting information. It's not. It is an excellent way of inducing compliance, but under those conditions a detainee will tell you anything that they think you want to hear. For the record, I view Al-Qaeda, ISIS, etc. as a bunch of war criminals who do not deserve the protection of the Geneva Convention because they flagrantly violate it. What does concern me is whether the US government is using effective techniques to extract information from suspects who might have information that would prevent terrorist atrocities. Hopefully, the intelligence community will point out to Trump the pitfalls of water-boarding and similar techniques and he'll listen to that advice. However, so far his actions and attitude toward evidence and rational thought don't inspire confidence.