Will there ever be a reliable lie detector?
For as long as we have been human we have looked for some way of telling when we are being told the truth. We tried dunking witches, only to find that buoyancy is not connected to the supernatural. We tried torture, but discovered that people will eventually say just about anything to make it stop. We experimented with scopolamine and sodium pentathol, to learn that ‘truth serums’ do little more than make their targets susceptible to suggestion. And we’re still trying – with scientists pushing MRI scans and ECGs alongside AI as a ‘brain fingerprinting’ technique. The jury is out as to whether the latest ideas will prove any more
