Cannabis Driving Laws in Alberta: THC Limits and Penalties

Driving with THC in your blood at or above set limits is a criminal offence in Canada — and Alberta layers its own immediate roadside penalties on top of the federal ones. None of it depends on how you feel, how recently you bought something, or whether you "seem fine." The federal offence is a number: nanograms of THC per millilitre of blood. This guide lays out the actual law as of June 2026 — the Criminal Code limits and penalty tiers, Alberta's Immediate Roadside Sanctions, the zero-tolerance rule for GDL drivers, how roadside oral fluid screening works, and the one legal way to carry cannabis in a vehicle.

This is legal information, not legal advice. If you are facing a charge or a roadside sanction, talk to a lawyer.

The federal offence is a blood number, not a feeling

When cannabis was legalized in 2018, Parliament rewrote the Criminal Code's driving provisions (former Bill C-46). The result, explained on Justice Canada's impaired driving laws page, is a set of offences based on the concentration of drugs in a driver's blood. The prohibited levels themselves are set out in the federal Blood Drug Concentration Regulations (SOR/2018-148).

For THC, there are three separate offences, measured within two hours of driving:

| Offence | THC level in blood | Type of offence | Penalty | |---|---|---|---| | Lower-level THC | 2 ng or more but under 5 ng per mL | Straight summary conviction | Maximum $1,000 fine | | Higher-level THC | 5 ng or more per mL | Hybrid (Crown can proceed summarily or by indictment) | 1st offence: mandatory minimum $1,000 fine; 2nd: mandatory minimum 30 days imprisonment; 3rd: mandatory minimum 120 days imprisonment; maximum 10 years imprisonment | | Combined alcohol + THC | 50 mg of alcohol per 100 mL of blood plus 2.5 ng or more of THC per mL | Hybrid | Same penalty scheme as the higher-level THC offence |

A few things worth understanding about how this is built:

• The 2 ng floor is deliberately low. Justice Canada describes the 5 ng limit as based on impairment considerations, and the 2 ng limit as based on public safety considerations. In other words, the lower offence exists to keep THC and driving separated as a matter of policy — you can be convicted at 2 ng without anyone proving you were impaired.
• These are "per se" offences. The Crown does not need to show bad driving. The blood concentration *is* the offence, the same way 0.08 works for alcohol.
• The old impairment offence still exists too. Driving while impaired by any drug remains a separate Criminal Code offence regardless of blood concentration, proven through observed driving, sobriety testing, and drug recognition evaluation.
• A conviction means a criminal record, on top of any fine or jail time, with everything that follows for employment and cross-border travel.

Alberta stacks provincial sanctions on top: Immediate Roadside Sanctions

Criminal charges go through the courts and take time. Alberta doesn't wait. Under the province's Immediate Roadside Sanctions (IRS) program, police can impose licence suspensions, vehicle seizures, and fines on the spot under the Traffic Safety Act — and these apply to drug impairment, including cannabis, not just alcohol.

The serious tier is IRS: FAIL, which applies at criminal-level impairment — including when a driver fails, or refuses, drug and alcohol testing:

• First occurrence: an immediate 90-day licence suspension during which you cannot drive at all, followed by a further 12-month suspension during which you may drive only if you participate in the ignition interlock program; a 30-day vehicle seizure; and a $1,000 fine plus a 20% victim fine surcharge.
• Second occurrence: the same 90-day hard suspension, followed by 36 months on the interlock program; a 30-day vehicle seizure; and a $2,000 fine plus the 20% surcharge.
• Third occurrence: the 90-day suspension followed by a lifetime suspension (you may apply for reinstatement after 10 years); a 30-day vehicle seizure; and a $2,000 fine plus the 20% surcharge.

Two points of fine print. First, the familiar IRS: WARN tier (3-, 15- and 30-day suspensions) is the alcohol-specific 0.05–0.079 blood alcohol range — there is no equivalent "warn" band for THC. Second, IRS penalties are administrative: they can be imposed even if you are never criminally charged, and a criminal charge can proceed *in addition* to them. Sanctions can be reviewed through SafeRoads Alberta, but the timelines are short.

Zero tolerance for GDL drivers

If you hold a Class 7 learner's licence or a Class 5-GDL licence, the rules are simpler and stricter: zero. Alberta extended its longstanding zero-alcohol rule for graduated drivers to include drugs, including cannabis. Under IRS: ZERO Novice, a GDL driver found with any alcohol or drugs in their body receives:

• a 30-day driver's licence suspension,
• a 7-day vehicle seizure, and
• a $200 fine plus the 20% victim fine surcharge.

Note the difference from the criminal limits: the federal offences start at 2 ng of THC per mL of blood, but for GDL drivers in Alberta the provincial threshold is *any detectable amount*. Alberta's cannabis framework was explicit about this from day one: "There will be zero tolerance for those on graduated licences" (Cannabis in Alberta framework, alberta.ca).

Given that nearly everyone starts driving on a GDL, this is the rule that matters for a lot of younger Albertans — and it's also worth knowing if you're a visitor comparing notes with our Calgary tourist legality guide.

How police screen at the roadside: oral fluid testing

Federal law gives police a specific tool for cannabis. As Justice Canada's drug-impaired driving FAQ explains, an officer who reasonably suspects a driver has a drug in their body can demand an oral fluid sample on approved drug screening equipment — a saliva test, done at the roadside. The grounds for suspicion can include things like red eyes, muscle tremors, agitation, or unusual speech patterns.

The devices detect the *presence* of THC in oral fluid; they are a screening step, not the offence itself. A positive screen gives police grounds to take the investigation further — typically a drug recognition evaluation or a blood sample, which is where the nanogram limits above actually get measured. Police forces aren't required to use the saliva devices and can rely on other tools, like standardized field sobriety testing.

One thing the law is unambiguous about: refusing to comply with a lawful demand — for a saliva sample, sobriety testing, or a blood sample — is itself a Criminal Code offence, prosecuted and penalized along the same lines as the driving offences. Alberta's IRS: FAIL sanctions also apply to drivers who refuse testing.

Transporting cannabis in a vehicle: the one legal way

Having cannabis in your car is legal in Alberta — but only one way. Section 90.25(1) of Alberta's Gaming, Liquor and Cannabis Act reads:

> "No person may transport cannabis in a vehicle unless the cannabis is contained in closed packaging that is out of reach of the driver and any other occupants of the vehicle."

In practice, that means two requirements at once:

1. Closed packaging. The sealed packaging it came in from the store satisfies this. An opened bag or a loose pre-roll in the cupholder does not.
2. Out of reach of everyone in the vehicle. Not just the driver — *any* occupant. The trunk is the clean answer. A glovebox within the driver's reach is not.

Section 90.24 of the same Act adds that no one may use cannabis in a vehicle — driver or passenger, moving or parked — with a single narrow exception for when the vehicle is genuinely being used as a temporary residence (the Act's words, aimed at situations like a parked RV).

The general possession rules ride along too: adults 18+ may carry up to 30 grams in public, and your vehicle on a public road counts as public. These transport rules apply on every kilometre of Alberta highway — including the drive west, which we cover in detail in our buying cannabis in Calgary before Banff guide, since national parks add their own wrinkles.

And if the errand itself is the problem: every Bud Mart product can come to you instead via $1.99 Toonie Delivery across Calgary, Airdrie, Chestermere and Didsbury, 9 a.m. to 10 p.m. daily — sealed, ID-checked at the door, and never your problem to transport.

There is no "safe hours after use" rule — the offence is the blood level

This is the part of the law people most want simplified, and the honest answer is that the law refuses to simplify it. Neither the Criminal Code nor any Alberta statute sets a number of hours after which driving becomes legal. There is no "wait X hours" provision anywhere in Canadian law. The offence is defined entirely by the concentration of THC in your blood at the time you drive — full stop.

Justice Canada addresses this directly in its drug-impaired driving FAQ: "the existing scientific evidence does not yet provide general guidance to drivers about how much cannabis can be consumed before it is unsafe to drive or how long a driver should wait to drive after consuming cannabis."

That's the federal government's own position: no reliable formula exists. How long THC remains in blood varies from person to person and product to product, and Alberta's road safety materials note that cannabis impairment can be less outwardly visible than alcohol impairment while still being impairment. The law doesn't distinguish between product formats either — whether THC entered your bloodstream via flower, a vape, or edibles, the nanogram limits are the same.

So we won't publish a "safe window," because none exists in law or in the science the law is built on. What exists is a blood test and a set of numbers. If there's any question, the only approach with zero legal risk is not driving — Calgary Transit, a cab, a rideshare, or a designated driver.

The rules at a glance

• 2 ng THC/mL of blood within two hours of driving: summary offence, up to a $1,000 fine.
• 5 ng THC/mL: hybrid offence — minimum $1,000 fine on a first offence, mandatory jail on repeats, up to 10 years.
• 50 mg alcohol/100 mL + 2.5 ng THC/mL: the combined offence, penalized like the 5 ng tier.
• Alberta IRS: FAIL: immediate 90-day suspension plus 12 months on ignition interlock, 30-day vehicle seizure, $1,000 fine plus surcharge — on top of, and independent of, criminal charges.
• GDL drivers: zero tolerance for any cannabis — 30-day suspension, 7-day seizure, $200 fine.
• In the vehicle: closed packaging, out of reach of everyone, no use by anyone.
• No legal wait time exists. The offence is the blood concentration.

You can find your nearest of our nine Alberta stores on the locations page — four across Calgary, two in Airdrie, one in Chestermere and two in Didsbury — all open 9 a.m. to 11 p.m.

FAQ: Alberta cannabis driving laws

What is the legal THC limit for driving in Canada?

Federal law sets three limits, measured within two hours of driving: 2 nanograms (ng) of THC per millilitre of blood is a summary conviction offence with a maximum $1,000 fine; 5 ng or more is a hybrid offence with a mandatory minimum $1,000 fine and up to 10 years imprisonment; and a combination of 50 mg of alcohol per 100 mL of blood with 2.5 ng or more of THC is its own offence penalized at the higher tier. The limits are set by the federal Blood Drug Concentration Regulations and apply identically everywhere in Canada, including Alberta.

What extra penalties does Alberta add for cannabis-impaired driving?

Alberta's Immediate Roadside Sanctions (IRS: FAIL) program lets police impose penalties immediately under the Traffic Safety Act, separate from any criminal charge: a first occurrence brings a 90-day licence suspension followed by 12 months in the ignition interlock program, a 30-day vehicle seizure, and a $1,000 fine plus a 20% victim fine surcharge. Second and third occurrences escalate to 36-month interlock terms, $2,000 fines, and ultimately a lifetime suspension. These apply to drug impairment including cannabis.

Can GDL drivers in Alberta have any THC in their system?

No. Alberta applies zero tolerance to drivers in the Graduated Driver Licensing program — Class 7 learners and Class 5-GDL probationary drivers. Any detectable alcohol or drugs, including cannabis, results in an immediate 30-day licence suspension, a 7-day vehicle seizure, and a $200 fine plus surcharge under IRS: ZERO Novice. The federal 2 ng criminal threshold is irrelevant here; for GDL drivers the provincial line is zero.

How do police test for cannabis at the roadside in Alberta?

An officer who reasonably suspects a driver has a drug in their body can demand an oral fluid (saliva) sample on federally approved drug screening equipment, based on observable signs such as red eyes, muscle tremors, agitation, or unusual speech. The saliva device screens for the presence of THC; a positive result leads to further investigation, typically a drug recognition evaluation or a blood sample, which is what the nanogram limits are measured against. Refusing a lawful demand is itself a Criminal Code offence.

How do I legally transport cannabis in my car in Alberta?

Alberta's Gaming, Liquor and Cannabis Act (s. 90.25) requires that cannabis in a vehicle be "contained in closed packaging that is out of reach of the driver and any other occupants." The simplest compliant setup is unopened, sealed packaging in the trunk. An open package, or any package within reach of anyone in the cabin — including the glovebox in most vehicles — does not meet the requirement. The 30-gram public possession limit for adults 18+ also applies inside your vehicle.

Can a passenger use cannabis in a vehicle in Alberta?

No. Section 90.24 of the Gaming, Liquor and Cannabis Act prohibits anyone — driver or passenger — from using cannabis in a vehicle. The Act's only exception is when the vehicle is being used as a temporary residence at the time, language aimed at situations like a parked RV serving as accommodation, not at ordinary travel.

How long after using cannabis is it legal to drive?

The law does not set a waiting period — no statute in Canada or Alberta says driving becomes legal a certain number of hours after use. The offence is defined solely by THC concentration in blood at the time of driving, and Justice Canada states that existing scientific evidence "does not yet provide general guidance" on how long a driver should wait after consuming cannabis. Because how long THC stays in blood varies by person and product, no time-based rule of thumb has legal meaning; the blood level is the law, full stop.

Can I refuse the roadside saliva test?

Refusing to comply with a lawful demand — for an oral fluid sample, sobriety testing, or a blood sample — is a Criminal Code offence in its own right, prosecuted along the same lines as the driving offences themselves. In Alberta, refusing drug and alcohol testing also triggers IRS: FAIL roadside sanctions immediately, including the 90-day suspension, interlock term, vehicle seizure, and fine.