Alcohol, Cannabis & Driving Laws Ontario 2026 — G1 Guide
Impaired driving is one of the leading causes of road deaths in Ontario. The G1 test always includes questions on alcohol and cannabis laws. This guide explains the rules clearly — BAC limits, zero tolerance for new drivers, penalties, cannabis storage rules, and what happens if you refuse a breathalyzer.
Based on the official Ontario Driver's Handbook and real DriveTest scenarios. Updated 2026.
BAC Limits in Ontario (2026)
Ontario uses a tiered system for blood alcohol concentration (BAC). The consequences escalate with the level of impairment detected:
Any detectable alcohol = immediate roadside suspension
Administrative penalties: 3-day suspension (1st), 7-day (2nd), 30-day (3rd+)
Criminal charge, licence suspension, possible jail time
Stricter limit applies to commercial vehicle operators
Penalties for Impaired Driving
Ontario's impaired driving penalties are among the strictest in Canada. They apply to both alcohol and drug impairment:
Cannabis & Driving Rules
Since cannabis was legalized in Canada in 2018, Ontario has strict rules for drivers. Cannabis impairment is treated the same as alcohol impairment under the law:
Zero tolerance for G1/G2
Any detectable THC in your system is illegal for novice drivers. There is no safe threshold — zero means zero.
Federal limit for full G
Fully licensed drivers: 2 ng/mL THC in blood is the federal limit. 2–5 ng/mL = hybrid offence; 5+ ng/mL = criminal offence.
Cannabis storage rules
Must be in a sealed, tamper-evident container in the trunk or out of reach. Open cannabis in the passenger area = fine.
Drug Recognition Evaluators
Ontario police use DREs and oral fluid tests at roadside to detect cannabis impairment. Refusing a drug test is a criminal offence.
New Driver Responsibilities — Alcohol & Drugs
As a G1 or G2 driver, you face stricter rules and harsher consequences for impaired driving than fully licensed drivers. Ontario's graduated licensing system is designed to build safe habits from day one:
Zero tolerance — always
G1 and G2 drivers must have zero blood alcohol and zero cannabis impairment at all times — not just at night or on highways. The rule applies 24/7 on every road.
Immediate suspension risk
Any detectable alcohol or drug impairment results in an immediate roadside licence suspension. There is no warning — the suspension happens on the spot.
Lower demerit threshold
Impaired driving convictions carry demerit points. G1/G2 drivers face suspension at just 9 points — a single serious conviction can trigger suspension.
Insurance consequences
An impaired driving conviction as a new driver can make insurance unaffordable or result in policy cancellation. Premiums can increase by 50–100% or more.
Accompanying driver rules
The accompanying driver for a G1 driver must also have a BAC under 0.05. An impaired accompanying driver is also breaking the law.
Quick Summary
- ✅ G1/G2 drivers: 0.00 BAC — zero tolerance, always
- ✅ Fully licensed: criminal limit is 0.08
- ✅ 0.05–0.079 = warn range = immediate 3-day suspension (1st offence)
- ✅ Cannabis impairment = same penalties as alcohol
- ✅ G1/G2: zero THC tolerance — any amount is illegal
- ✅ Cannabis must be sealed in trunk or out of reach
- ✅ Refusing breathalyzer = criminal offence
- ✅ Impaired driving conviction = mandatory Back on Track program
- ✅ Never drive after drinking or using cannabis
Practice Quiz
5 QuestionsWhat is the blood alcohol concentration (BAC) limit for fully licensed drivers in Ontario?
Frequently Asked Questions
Can I drive after one drink?
Even one drink can raise your BAC above 0.00, which is illegal for G1 and G2 drivers. For fully licensed drivers, one drink may push you into the warn range (0.05). The safest choice is zero alcohol before driving.
Does cannabis stay in your system longer than alcohol?
Yes. Cannabis can impair driving for several hours after use, and THC can remain detectable in your body for days. Ontario police use drug recognition evaluations and oral fluid tests to detect cannabis impairment.
What happens if I refuse a breathalyzer test?
Refusing a breathalyzer is a criminal offence in Canada. The penalties are the same as or greater than those for impaired driving — including a criminal record.
What are the penalties for a G1 driver caught with alcohol?
A G1 driver caught with any alcohol faces an immediate 24-hour roadside licence suspension. A second offence within 5 years results in a longer suspension and mandatory education program. Because G1/G2 drivers face suspension at 9 demerit points, any conviction compounds the risk.
How must cannabis be stored in a vehicle?
Cannabis must be stored in a sealed, tamper-evident container in the trunk or in a location not accessible to the driver or passengers. Open cannabis in the passenger area is treated like open alcohol and can result in a fine.
What is a Drug Recognition Evaluator (DRE)?
A DRE is a specially trained police officer who can evaluate drivers for drug impairment at the roadside. They use a 12-step evaluation including eye tests, divided attention tests, and vital signs. Ontario police actively use DREs to detect cannabis and other drug impairment.
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