Fighting a cannabis-impaired driving charge in London involves challenging the accuracy of the roadside saliva test or the subjective observations of the Drug Recognition Evaluator (DRE). Because THC can stay in your system for days without causing active impairment, a skilled lawyer can often create reasonable doubt at trial.
While cannabis is perfectly legal to consume in Canada, driving under its influence is a serious criminal offence. Many drivers are shocked to find themselves handcuffed by the London Police Service simply because they smoked a joint the night before. Unlike alcohol, measuring cannabis impairment is not an exact science.
If you have been charged with drug-impaired driving, you are facing the exact same penalties as a drunk driver, including a criminal record and a suspended licence. Navigating the legal system at the Middlesex County courthouse requires a specific, highly technical defence strategy. Here is how a local law firm will generally fight a cannabis driving charge.
Step-by-Step Process in London
Defending against drug charges is complex because the testing technology is relatively new and open to legal scrutiny. Most applicants in Ontario follow these steps to build a strong defence. 📋
Step 1: Challenging the Roadside Stop
Your lawyer will first examine why the London Police pulled you over. Police cannot demand an oral fluid (saliva) test randomly; they must have reasonable suspicion that you have drugs in your body. If the officer lacked a valid reason to test you, your lawyer could argue a violation of your Charter rights.
Step 2: Analyzing the DRE Report
If you fail a roadside test, you are typically taken to the police station on Dundas Street to be evaluated by a Drug Recognition Evaluator (DRE). The DRE performs physical tests, like checking your pulse and pupil dilation. Because this evaluation is highly subjective, your lawyer will aggressively cross-examine the officer’s notes and training. 🔍
Step 3: Scrutinizing Blood Test Results
The core evidence is usually a blood test. In Canada, the legal limit for cannabis is 2 nanograms (ng) to 5 ng of THC per millilitre of blood. Your defence team will verify if the blood was drawn within the legal time limits and handled properly by the forensic lab to prevent contamination.
Step 4: Hiring a Toxicologist
Because THC is stored in fat cells, it can show up in blood tests long after the “high” has worn off. Your lawyer will likely hire a private toxicologist to testify at the Ontario Court of Justice that the THC levels in your blood did not necessarily mean you were actively impaired while driving.
Alcohol vs. Cannabis Testing Limits
The law treats alcohol and cannabis differently. Here is a quick comparison of the legal limits in Canada:
| Substance | Legal Limit (Fully Licensed Driver) | Testing Method |
|---|---|---|
| Alcohol | 80 milligrams per 100 ml of blood (Over 80) | Breathalyzer / Intoxilyzer |
| Cannabis (Low Level) | 2 ng to under 5 ng of THC per ml of blood | Saliva Swab / Blood Test |
| Cannabis (High Level) | 5 ng or more of THC per ml of blood | Saliva Swab / Blood Test |
How Much Does it Cost in London?
Defending a drug-impaired driving case is generally more expensive than an alcohol case because it requires specialized expert witnesses. Expect these costs in Canadian dollars (CAD):
- Lawyer Fees (Resolution): If the case is settled early through negotiations with the Crown Attorney, expect to pay between $4,000 and $7,000 CAD.
- Lawyer Fees (Trial): Taking the case to a full trial at the London courthouse will typically cost $8,000 to $15,000 CAD.
- Toxicologist Expert: Hiring a private medical expert to challenge the blood and DRE results generally adds $3,000 to $6,000 CAD to your legal bill.
How Long Does the Process Take?
Drug-impaired driving cases often take much longer to resolve than standard alcohol cases. Waiting for the Centre of Forensic Sciences to process the blood samples and send the disclosure to your lawyer can take 4 to 8 months alone. If you proceed to a full trial, the entire legal process under the Canadian justice system can take 12 to 18 months to conclude. ⏱
Frequently Asked Questions (FAQ)
Can I drive if I have a medical marijuana prescription?
No. Having a medical prescription allows you to possess and use cannabis, but it does not give you the right to drive while impaired or while over the legal THC limits in Ontario.
Are roadside saliva swab tests accurate?
Roadside oral fluid screening devices are known to have reliability issues. A positive result gives police grounds to arrest you, but a lawyer can often challenge the machine’s calibration and accuracy in court.
Will my licence be suspended immediately for cannabis?
Yes. If you fail a DRE evaluation or a roadside test, you face an immediate 90-day Administrative Driver’s Licence Suspension (ADLS), just like an alcohol-related arrest.
What happens if I refuse the saliva test?
Refusing a lawful demand for a saliva test or a DRE evaluation is a separate criminal offence called “Failure or Refusal to Comply.” The penalties are identical to a conviction for impaired driving.
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