Land Transport Act 1998

Fees and charges

Schedule 5: Blood concentration levels for offences related to drug driving

You could also call this:

“How much drugs in your blood can get you in trouble when driving”

This schedule shows the blood concentration levels for different drugs that are considered illegal when driving. The schedule has two parts: high-risk levels and tolerance levels.

The high-risk levels are the amounts of drugs in your blood that are considered very dangerous when driving. For example, if you have more than 3 ng/ml of THC (the active ingredient in cannabis) in your blood, it’s considered high-risk.

The tolerance levels are lower amounts of drugs in your blood that are still not allowed when driving. For instance, having more than 1 ng/ml of THC in your blood is above the tolerance level. These levels help make sure that even small amounts of drugs don’t affect your driving.

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This page was last updated on

View the original legislation for this page at https://legislation.govt.nz/act/public/1986/0120/latest/link.aspx?id=LMS823266.


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5Blood concentration levels for offences related to drug driving Empowered by ss 2, 167AAA, 167AAB

1High-risk blood concentration levels for drug-driving offences

The following table is small in size and has 2 columns. Column 1 is headed Qualifying drug. Column 2 is headed High-risk level (ng/ml).
Qualifying drug High-risk level (ng/ml)
Alprazolam 50
Amphetamine 100
Buprenorphine 1
Clonazepam 50
Cocaine 20
Codeine 200
Diazepam 200
Dihydrocodeine 200
Fentanyl 0.5
GHB 50,000
Ketamine 50
Lorazepam 30
MDMA 50
Methadone 200
Methamphetamine 50
Midazolam 30
Morphine 20
Nitrazepam 50
Oxazepam 800
Oxycodone 50
Temazepam 800
THC (cannabis) 3
Tramadol 250
Triazolam 4
Zopiclone 50

2Tolerance blood concentration levels for drug-driving offences

The following table is small in size and has 2 columns. Column 1 is headed Qualifying drug. Column 2 is headed Tolerance level (ng/ml).
Qualifying drug Tolerance level (ng/ml)
Alprazolam 20
Amphetamine 20
Buprenorphine 1
Clonazepam 20
Cocaine 5
Codeine 50
Diazepam 100
Dihydrocodeine 50
Fentanyl 0.5
GHB 10,000
Ketamine 10
Lorazepam 10
MDMA 10
Methadone 50
Methamphetamine 10
Midazolam 10
Morphine 10
Nitrazepam 20
Oxazepam 200
Oxycodone 20
Temazepam 200
THC (cannabis) 1
Tramadol 100
Triazolam 4
Zopiclone 20