The number of roadside drug tests in New South Wales will triple and new laws will tackle the drug ice if the Coalition is re-elected later this month, Premier Mike Baird has announced.

Opposition Leader Luke Foley, on the campaign trail in Sydney, said if Labor won government, the police force would be boosted by an extra 480 officers.

NSW voters head to the polls on March 28.

Mr Baird was in Dubbo in the state's west to help launch the start of the Nationals' election campaign.

He said ice, or methamphetamine, was a scourge on society and it was time to "push back".

Mr Baird said along with increased drug tests, a Coalition government would also halve the threshold needed for a charge of supply, and require pharmacies to keep electronic records of pseudoephedrine sales. Pseudoephedrine can be used to make ice.

"We are saying to those drug peddlers, those suppliers, those manufacturers, don't do it, we know the harm you are causing across New South Wales and we are determined to stop you," he said.

"These measures we strongly believe will do that. Enough is enough, it's time we pushed back, to make a difference and that is what we are doing.

"We have consulted widely with health professionals, the police, [and asked] what tools do we need to ensure we start winning this war?

"The three key things we are doing, we are ensuring we are tripling the amount of drug-driving testing across New South Wales.

"Over 13 per cent of fatalities on our roads, it's found drivers have drugs in their body. That must stop."

Mr Baird said the Government would also invest in three rehabilitation services on the mid-north coast, western Sydney and the Illawarra.

Labor promises to increase NSW police force by 480 officers

Meanwhile, Mr Foley said Labor's initiative to boost police numbers would be rolled out this year, with 180 officers deployed by August and another 100 officers each year until 2018.

Last week Mr Baird announced an additional 310 police if his Government was re-elected.

NSW Opposition Leader Luke Foley announces a Labor government will add 480 extra police officers on the beat. ( ABC: Jean Kennedy )

"Labor's plan for the state involves using the profits from our electricity network to keep delivering more police, more paramedics, more nurses and more teachers," he said.

"That's why I can go further than Mr Baird, because we will use the profits from the electricity network to deliver more frontline workers, including rank-and-file police."

Mr Foley said the plan would cost $70 million and include $54 million for salaries, and nearly $20 million for training.

"Our police put their lives on the line day in and day out, protecting our community and Labor will support them by giving them the resources they need to do their job," he said.

"We will boost our police force with extra officers to ensure that our local police stations are properly staffed.

"By putting more police on our streets we can ensure that we further drive down crime and anti-social behaviour that impact all members of our community."

Greens launch campaign with social housing plan

The Greens officially launched their state election campaign on Saturday, announcing plans to tackle long-term unemployment and boost social housing.

Greens MP John Kaye was also in Sydney and said, if elected, his Government would spend $4.5 billion of borrowed funds on social and affordable housing, with the aim of 20,000 new and affordable units over the next four years.

"The Greens have been guided by housing experts, we think that these housing units should be available across the city," Mr Kaye said.

"It shouldn't be that because you are in an affordable housing unit you have to be out in the west."

Mr Kaye said the Greens opposed power privatisation, but the party had already outlined an alternative strategy to borrow an additional $20 billion for infrastructure, which would be paid back by raising property and poker machine taxes.

"We'll have a number of new ideas focusing on the longer term unemployed and also looking at affordable housing," Mr Kaye said.

"There's plenty of money in the state without privatising the wires and poles, to build an economy that is fit for the 21st century."