As any faithful Harry Potter nerd will know, lies cannot always be concealed. Veritaserum (or truth serum) is a magically concocted potion that can cause even the most perfected liar to indulge his deepest darkest secrets.
Is it possible that such a potion actually exists in real life? Not so much. While some have been fooled by the effects of the class of drugs named barbiturates, research reveals its actual abilities. These drugs typically relax people and can even make them fall asleep. During the 1930s and 1940s, people used these drugs to uncover unconscious material of those around them.
However, in 1963 the U.S. supreme court discovered confessions made under this "truth serum" were not concrete or always accurate. Studies have shown that participants were able to lie under the influence of the "truth serum". It was obvious as to why previous people had believed confessions to be true; barbiturates lower the threshold for reporting all memories. While people assumed all of these memories to be true, not all of them were. In other words, injecting someone with a barbiturate drug is the same as getting someone wasted. They don't always tell the whole and honest truth, but they just might confess their love for their best friends girlfriend.