I was reading this grisly report about India’s suspected third serial killer which mentions forensic scientists using a “truth serum” on two suspects. One is said to have confessed to eating the liver and flesh of his young victims.

I thought this was the stuff of fiction, but is seems not. So what is a truth serum made from? Is the evidence it elicits admissible in a court of law? What proof is there about its effectiveness? Do other countries use similar means to extract confessions? Should we use it on our politicians?