Avsnitt 22

When there is insufficient evidence or cooperation from the suspect - what’s left for authorities to try to get a conviction? The 'Mr. Big' technique is often a last resort for police to solve a murder. But the elaborate tactic to elicit confessions from suspects is under fire. The technique has become so controversial that some countries have gone as far as to ban the practice . Reporter Jayme Doll delves into a number of high profile cases and examines: how far should undercover police go to catch a killer?