The State Labor Opposition's call comes after it was revealed in budget estimates hearings that mental health issues account for 30 per cent of all calls to the NSW Police.

The Opposition says that ever since Mental Health Crisis Teams were removed from the NSW Health system, police have become the first responders when it comes to contact with people suffering from mental illnesses who require immediate assistance.

The gap made by the removal of crisis teams means that police are increasingly called on to deal with these matters as they have broader powers to detain, the right to use force and are more often than not first on the scene.

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Ms Saffin said that sometimes this means police are often faced with no option other than to use a Taser or firearm when confronted with an armed person suffering a mental health problem.

In more than a third of cases of Taser use across NSW recently examined by the NSW Ombudsman, NSW Police believed the person of interest involved was suffering from or had suffered from a mental health issue.

Labor is calling on the NSW Government to hold a public inquiry into Section 14 of the Mental Health Act. In 2012 the NSW Legislative Council passed a motion calling on the Coalition Government to conduct a public inquiry in to the Mental Health Act and, in particular, into Section 14 of that Act.

"No police officer wants to pull a taser on someone who is sick, but they are now on the front lines of the growing mental health crisis in the community," NSW Shadow Minister for Police Lynda Voltz said.

Ms Saffin said the system can no longer go on like this.

"NSW needs better dedicated front line mental health services so people who are ill get the care they need and our police can focus on fighting crime.

"The government should act now and hold an inquiry to hear from health professionals, nurses, patients, carers, our police and the community so we can begin to address the crisis in mental health across NSW."