An internal police review paints a broken picture of New Zealand's bail system.

The report shows 0.4 percent of offenders - one in 250 - are automatically flagged as high risk, while low risk offenders are needlessly targeted, because police IT systems aren't fit for purpose.

Police Deputy Commissioner Naila Hassan acknowledges the current bail management application system isn't fit for purpose by today's standards.

"The IT system first came in about 10 years ago, and we know technology turns back a long time ago. So the bail management application isn't fit for purpose today in order to prioritise offenders on bail."

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