A criminal defence lawyer warns a new National policy is tackling a very vexed area of law. 

The party is campaigning on removing the right to remain silent when a child under 12 is killed.  

The party suggests this is an exceptional circumstance that justifies breaching the Bill of Rights Act. 

Barrister John Munro told Mike Hosking there is likely a low number of cases where someone hasn't been convicted, because someone maintained their right to silence. 

He says there's probably the same number of cases where people with low IQ or under duress are being told to say things, when they don't want to. 

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