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National says prisoner numbers will rise as crime goes down if it wins power in October.

The party's new crime policy would make being a gang member an aggravating factor during criminal sentencing.

Leader Chris Luxon told Mike Hosking that there'll be more to come in its broader policy to be announced shortly \u2013 and more prisoners will be a consequence of chasing down crime.

He says the Government has emptied out prisons by a quarter in the past six years, but crime is up 30 percent, and retail has jumped 40 percent.

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