In movies you often see people are givin a so called truth serum that makes it impossible for them to tell a lie... Wonder if that's possible in real life. I've heard that LSD has been used in the way by the russian military.
There are some tests to find out if a person is telling the truth, It is known a polygraph test. It is not any drug but you will be connected to a system which counts your pulse rate. If you are lieying your pulse rate will abnormally increase, and the graph shows that. This device is used by police and forensic experts everywhere.
