Mr Big is a powerful technique that can bring justice to murder victims.
But experts disagree about its effectiveness.
Some support the technique. Others think Mr Big stings exploit people’s vulnerabilities and encourage them to lie.
Not all countries use the sting, including the United States of America and the United Kingdom.
In Canada, police employ some surprising and troubling variations on Mr Big to get the accused to confess..
But despite all this, an undercover police team here in New Zealand get approval to run Mr Big on David Lyttle.
Will it work?
Written and presented by Steven Price
Executive Producers Justin Gregory, Katy Gosset & Tim Watkin
Director Duncan Smith
Music Ebony Lamb and Gram Antler
Images by Ebony Lamb. Design by Jarred Bishop
Supported by the Michael and Suzanne and Borrin Foundation and Te Kauhanganui Tatai Ture, Faculty of Law, Victoria University of Wellington