For anyone interested in the real world "truth serum", many attempts by different countries to use medications as a form of interrogation have been tested. Publicly, the FBI has considered using Medazolam to try to get confessions or information from people and have succeeded in attempts to get information that would otherwise be withheld. However, those types of medications tend to put the person the drug is being used on into a state of mind where any and all types of information is stated without any attempt to either intentionally lie or only tell the truth. In the case of trying to use the information given by a drugged individual you may get conflicting testimonies or even fabricated statements because the drugged individual is simply voicing random trains of thought or ideas they are having. So the conclusion is that drugs can alter a person's state of mind and get them to give up information that might help, but it might also cause that person to just make up stories that are of no use or otherwise detrimental in determining what is the actual truth of a matter.