Political message?
It is interesting that this movie was released in the same year that President Barack Obama was elected and made an executive order to close the Guantanamo Bay Naval Base detention camp. I doubt that the interrogation and or torture at GITMO is nearly as brutal or deadly as that depicted in this film but I do think that the message is this: torture makes people tell lies more than the truth. People will do whatever they can to get out of an uncomfortable situation. They may tell half truths like Edie did about the meth lab. I also think that the movie shows that if a person is willing to torture extensively, things can get out of control resulting in people doing things that are against set rules and limitations.
Traditional techniques of asking a person to tell their story every day and making notes of details works best. The truth will leak out if you badger them enough especially if you give them privileges for giving useful intel. This is how detectives in the US get information from suspects. It doesn't take water-boarding. It just takes time and vigilance. Torturing a person on a foreign land makes them desperate and they may give up hope of ever going home. If this happens, they may never tell what they know. Torture may work for some but it will not break the will of all.
This movie shows what happens when torture and lying get out of control. had the guys stopped and asked questions, they would have found out that Al was in jail. Eddie could have framed someone else, like Lexi, for the meth lab.
Dreammaker182