Gemma Kirby knows first-hand how P can tear a family apart, after her 15-year-old sister formed a "hellish addiction" to the drug.

At least 50 babies exposed to P in the womb are born at Auckland City Hospital every year - a figure touted to be the "tip of the iceberg".

There could be 31.9 million adults now using marijuana - with 8.4 million of them using it a lot.

A student is held in custody after being charged with possession of amphetamine and steroids while on bail awaiting trial for other drugs charges.

Former ice addicts are visiting schools to tell children aged just seven years old about their experiences with crystal methamphetamine.

Police seized 3-4kg of methamphetamine including 1kg of crystallised P in a glass pot.

Exclusive: The Government looks set to introduce a new testing regime to catch drug-impaired drivers and prevent more carnage on our roads.

Watch NZH Focus: Pills in Prince’s home were mislabeled according to reports coming out if America. Some contained fentanyl - a synthetic opioid 50 times more powerful than heroin. So 4 months after the singer died - here’s a look at what we know and what we don’t.

COMMENT: The deeper I delve into the issue, however, the more I am struck by just how frightening the consequences of prohibition are.

COMMENT: Latest poll suggests more Kiwis favour legalising cannabis use, rather than just decriminalising it. Why don't our politicians get the message?

EXCLUSIVE: A new poll ahead of a review of the law around possession of cannabis for personal use suggests there is public appetite for reform.

Chantix has now played a crucial role in a second violent crime as a man was found not criminally responsible for shooting his wife in the neck.

COMMENT: There's been a lot discussed about all the problems P smoking brings, but what about the real cost to the owners of these properties?

The author of the report which exposed Russian state-sponsored doping ahead of the Olympics has slammed the IOC for misrepresenting his findings.

Drug testing comes in - student enrolments drop.

A Treasury official suggested the Government could save more than $500 million a year legalising the popular drug.

Russia and her allies have started a fightback to stay in the Rio Olympics after the sensational disclosures about a state-directed doping programme.

Watch NZ Herald Focus: Russia's participation in the Rio Olympics is still uncertain as the IOC explores legal options for banning the country from the Games. Also Lady Gaga and her fiancé, Taylor Kinney, are ending their 5 year relationship

The principal of one of Auckland's top colleges has urged parents not to smoke cannabis in front of their children.

Giving up alcohol or smoking could soon be much easier - by using a brain implant which stops cravings.

Court documents reveal criminal histories and rocky relationship before pair killed Moko.

Customs bust a shipment of 4000 handbags from China hiding 30kg of methamphetamine.

New report says legal high godfather Matt Bowden is living in Thailand and liquidators say they have been unable to contact him.

COMMENT: While Massive meth bust highlighted a new trend in the distribution of methamphetamine in NZ, it likely signals a shift in our underworld too.

A seventh person has been arrested in relation to the country's biggest meth bust in Northland two weeks ago.

COMMENT: Cannabis is one of the most widely available illicit drugs in New Zealand - but what impact is it having on our wellbeing?

Nearly 50kg more methamphetamine has been found by police hidden in sand dunes in Northland.

COMMENT: Marijuana will probably be legalised in New Zealand at some point. It's the way the western world is going, writes Matt Heath.

Two arrests have been made in the second incident this week where residential apartments and motels were being used to supply methamphetamine.

COMMENT: Why do some political leaders change their tune on drugs once they're no longer actively involved in politics?