Driving and Medical Cannabis: Practical Info for Patients in New Zealand

Alternaleaf Team
Written by
Alternaleaf Team
Jan 5, 2025
Last updated:
Jan 6, 2025

In New Zealand, the laws surrounding medicinal cannabis and driving align with those for any other prescription medication that has the potential to cause impairment. If you're a patient using medical cannabis products, understanding the legal framework and how it applies to your specific prescription is crucial for staying safe and compliant on the road. This article will explore the intersection of medicinal cannabis use, drug testing, and driving regulations in New Zealand.

How Does Cannabis Affect Driving?

Medicinal cannabis encompasses a range of products containing various cannabinoids, primarily tetrahydrocannabinol (THC) and cannabidiol (CBD). THC is the compound associated with psychoactive effects and impairment, potentially affecting coordination, reaction time, and judgment. CBD, on the other hand, is non-intoxicating and generally does not impair driving abilities.

If you are using a CBD isolate medicine containing no THC, it is unlikely you will test positive in a roadside drug test or experience any impairment. Many patients wonder, "Does CBD oil show in a drug test in NZ?" The answer is generally no for pure CBD products. However, products containing THC, even in small amounts, can impact some drivers and may lead to a positive test under certain conditions. This raises the question: how long does weed stay in your system? The answer varies depending on factors such as dosage, frequency of use, and individual metabolism. Some individuals may consider options for THC detox NZ if they are concerned about detection.

Can You Legally Drive After Using Medicinal Cannabis?

Yes, you can legally drive after using medicinal cannabis in New Zealand if:

  1. You are not impaired at the time of driving.
  2. You have a legal prescription for your medicine that meets the minimum quality standard.

Under Section 16 of the Land Transport (Drug Driving) Amendment Act 2022, medicinal cannabis patients with a legal prescription have an exemption from penalties if they test positive for THC but are not impaired while driving. This exemption protects patients from being penalised solely based on positive drug test results, provided they can demonstrate lawful use and non-impairment.

Determining Impairment

The law places responsibility on police officers to assess whether a driver is impaired. Signs of impairment could include erratic driving, slurred speech, or difficulty performing roadside tests. Testing positive for THC without showing signs of impairment should not result in penalties under the medicinal cannabis exemption.

For patients using CBD isolate products without THC, impairment is highly unlikely, and positive test results are uncommon. However, it's essential to be aware of the potential for drug-impaired driving, even when using prescribed medications.

Roadside Drug Testing in New Zealand

Roadside drug testing in New Zealand primarily uses saliva tests or oral fluid testing to detect the presence of drugs, including THC. Here's how drug testing in NZ works:

  • CBD-Only Products: If you are using CBD isolate products without THC, you are not likely to test positive during a roadside drug test.
  • THC-Containing Products: THC can be detected in saliva for several hours after use and may remain detectable in the body for days or weeks, depending on factors like dosage, frequency of use, and metabolism. NZ THC oil users should be particularly aware of this.

Even if you test positive for THC but are not impaired, Section 16 of the Land Transport (Drug Driving) Amendment Act 2022 protects medicinal cannabis patients from penalties. Always carry proof of your prescription to demonstrate lawful use of controlled drugs.

Tips for Driving Safely with Medicinal Cannabis

  1. Know Your Medicine: Understand whether your prescription contains THC, CBD, or a combination of both.
  2. Monitor Your Impairment: If you feel drowsy, disoriented, or otherwise impaired, do not drive until the effects have completely subsided.
  3. Carry Your Prescription: Keep a copy of your medicinal cannabis prescription with you to demonstrate legal use if required.
  4. Consult Your Doctor: If you are unsure about the effects of your medicine on your ability to drive, discuss this with your prescribing doctor or cannabis clinic.

The Exemption for Medicinal Cannabis Patients

Section 16 of the Land Transport (Drug Driving) Amendment Act 2022 is a significant protection for medicinal cannabis patients. It acknowledges that THC may remain detectable in the body long after its impairing effects have subsided and ensures that lawful medicinal cannabis use does not result in unfair penalties.

This exemption highlights the importance of lawful use and non-impairment. While it provides a safeguard, it is not a free pass to drive while impaired. Police officers still have the authority to assess impairment and act accordingly.

Workplace Considerations

For medicinal cannabis patients, it's important to consider workplace safety and drug testing policies. Many employers, especially those with safety-sensitive roles, may conduct random testing or pre-employment screening. While the medical defence provided by the Land Transport Act doesn't necessarily apply in workplace settings, employees should discuss their medicinal cannabis use with their employers and explore options for reasonable accommodation.

Key Takeaways

  • Driving under the influence of any impairing substance, including THC, is illegal in New Zealand.
  • Medicinal cannabis patients with a legal prescription are exempt from penalties for positive THC tests if they are not impaired.
  • CBD isolate medicines without THC are unlikely to result in impairment or positive drug tests.
  • Always carry proof of your prescription and discuss your driving safety with your doctor if you have concerns.
  • Be aware of workplace drug and alcohol policies and how they may affect your employment.