Civil libertarians have condemned the New South Wales Government for supporting an expanded use of Taser guns by police.

Police Commissioner Andrew Scipione is preparing a submission for the Government to widen the use of the stun guns, which are currently restricted to three specialist police units.

In the US to assess the way the weapons are used, Police Minister David Campbell has told The Sydney Morning Herald he would back an expansion of their use in principle.

But Council for Civil Liberties secretary Cameron Murphy says Tasers are dangerous and potentially fatal.

"In the United States, there are more than 200 deaths as a result of the use of Taser guns that are under inquiry at the moment," he said.

"What we ought to be doing is not expanding the use of Taser guns until we know the results of inquiries in the United States."

Mr Murphy says the Government needs proof that Tasers are safe.

"If [a stun gun] is there, then police may use it because it's easier to pull out the Taser and use that on someone than it is to physically restrain and subdue them," he said.

"The problem with doing that is that there's a high risk that someone may have a serious injury or they may in fact die when they're Tasered."

Tasers cause severe pain and immobilise muscle contractions by shooting two darts that deliver electrical pulses.

The state Ombudsman is reviewing their use after a number of deaths overseas but the NSW Police Association wants them issued to all front-line officers, saying they can save lives and defuse extreme situations.

The Queensland Government last week announced a trial of Tasers would be widened from selected officers to all the state's front-line police.

Seventy-four Tasers were also sent to the Northern Territory to be used by some police instead of guns on Friday.

Amnesty International has linked hundreds of deaths to the use of stun guns.