The New South Wales Government has introduced legislation to replace the state's three police integrity bodies with one.

If passed through Parliament, the Law Enforcement Conduct Commission will replace three investigative bodies that oversee police conduct, administration and corruption.

The Police Integrity Commission, the Police Division of the Office of the Ombudsman and the Inspector of the NSW Crime Commission would be replaced by the new body.

The commission would have new powers to monitor critical incident investigations and the ability to compel people to give evidence in relation to them.

Police Minister Troy Grant said the commission's powers would be similar to that of a royal commission.

He said the new body would "have a more active role in oversight for critical incident investigations".

Mr Grant said the new commission would take over all investigations being handled by the current bodies.

"I can assure the community that the new Law Enforcement Conduct Commission will be substantive," Mr Grant said.

"It will take over the investigations that currently sit on the books of the Police Integrity Commission and those contained within the office of the police oversight of the Ombudsman."

Police will continue to investigate police: Greens

Greens MP and justice spokesman David Shoebridge said while the current police integrity system was overly cumbersome, the proposed new model was also flawed.

"There is real merit in reducing that complexity and having one overarching body," Mr Shoebridge said.

"I think one of the real concerns about this reform, that's being proposed, [is] again we're going to have an oversight body that is going to be reviewing the actions of police investigations, rather than in most cases, doing the investigations themselves.

"The danger is that again, we have police primarily investigating police.

"And whether it's a critical incident, where a police officer has been seriously injured or a citizen has been injured or killed in police operations, or whether it's a concern about substantial other misconduct ... it appears we're still going to have the primary investigation being done by police.

"So we're repeating the mistakes of the past."

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