In 2018, New Zealand police began using a controversial interviewing tactic to crack cold case killings. The public knew nothing about it until this year. However, a 12-month Stuff investigation has revealed strong concerns about police interviewing tactics were raised long before one interview led to a false confession and a collapsed murder case. Moreover, the actions of the top officer who created the technique have been questioned for many years before he retired in October. Senior Writers Mike White and Blair Ensor reported on this story together.

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