how can youy make a liar tell the truth? – Secondary 11

Question: how can youy make a liar tell the truth?
- Keywords:
  liar,
  psychology,
  truth
Asked by tiggerific to Jemma, John, Katie, Lisa on 9 Jul 2012.
- John Perry answered on 9 Jul 2012:
  
  ooh, tough one @tiggerific!
  
  Without torture, I would suggest logically unpicking their argument. Consider the process of going from A to B to C. Lying is not an easy skill and generally when unpicked, there will be a logical problem somewhere along the line.
  
  We should remember though that sometimes we simply get confused. So we might get something wrong but that does not mean we are lying.
  
  John

Question: how can youy make a liar tell the truth?