New Zealand is in the grip of a methamphetamine crisis more severe than ever before. According to The Drug Detection Agency (TDDA), results from workplace drug testing in late 2024—mirrored by Police wastewater data—confirm the highest levels of methamphetamine use ever recorded in the country. Worryingly, these numbers are continuing to rise in 2025, with amphetamine detections at an all-time high.

Glenn Dobson, CEO of The Drug Detection Agency and former Canterbury Drug Squad Detective, is sounding the alarm. TDDA’s vast network of workplace screenings show meth use escalating across industries—raising critical safety, compliance, and operational issues for businesses of every size. 

“More people than ever are using meth, and this is not something employers can ignore,” Dobson says. “The risks are immediate and serious—especially in sectors like transport, farming, construction, and forestry, where safety is paramount."

Methamphetamine has well-documented effects: Dizziness, Impaired coordination, Aggressive behaviour, Poor judgement.

Not only can these symptoms lead to dangerous mistakes, but after meth use stops, users experience a "crash"—severe fatigue and sleep deprivation. Dobson warns, “We’ve heard of drivers falling asleep at the wheel after a meth binge. These hangover effects can be just as risky as being under the influence.” 

For businesses with vehicles, heavy machinery, or dangerous animals on site, meth use within the ranks is a serious red flag.

Dobson notes, “The signs of meth use are very different from cannabis. Meth users can be excessively agitated, paranoid, or unpredictable—so approaching them requires care, tact, and always a focus on safety.”

If you suspect someone is high at work: Do not confront them alone—ensure support is present. Remove them from safety-sensitive tasks. Follow your workplace’s drug and alcohol policy immediately. Ensure their confidentiality and safety until they can be appropriately assessed.

New Zealand’s meth crisis reflects global drug trends. Methamphetamine is frequently trafficked by international cartels, making its way into the country via new and covert routes. “We’re seeing a relentless flow of meth—smuggled in ever more creative ways,” says Dobson. “It’s a global supply issue with local consequences.”

With detection rates surging, Dobson expects an increase in both workplace and roadside drug testing in 2025. The focus will be on faster, more sophisticated methods, and ensuring businesses stay ahead of compliance requirements.