Drug and alcohol testing in Ontario is legal only in limited circumstances, and employers generally need a legitimate workplace safety reason to require a test.
Testing is easier to justify in a genuinely safety-sensitive job where there is reasonable cause to suspect impairment, after a serious workplace incident where impairment may have contributed, or as part of an appropriate return-to-work arrangement.
If your employer orders you to take a test, don’t automatically refuse. An improper testing policy can raise legal issues, but refusing a lawful direction can also put your job at risk. Ask why you are being tested, review the policy and get advice before making a decision where possible.
On This Page:
- 1. Can Your Employer Test You?
- 2. When Testing May Be Allowed
- 3. Random & Pre-Employment Testing
- 4. Positive Tests, Refusals & Termination
- 5. Addiction & Accommodation
- 6. Ontario Testing FAQs
Can Your Employer Drug or Alcohol Test You in Ontario?
Sometimes, but an Ontario employer does not have a general right to test employees whenever it wants.
Drug and alcohol testing is intrusive and can reveal sensitive information. The employer’s safety concerns must therefore be balanced against the employee’s privacy and human rights.
An important question is whether your job is safety-sensitive. This generally means that impaired performance could create a serious risk of injury or significant damage.
Examples can include some jobs involving:
- Driving
- Heavy equipment
- Dangerous machinery
- Industrial operations
- Public safety
But calling a position “safety-sensitive” does not give an employer unlimited testing rights. The reason for the test still matters.
For the broader Canada-wide rules, see our guide to drug and alcohol testing at work in Canada.
When Can Drug or Alcohol Testing Be Allowed in Ontario?
Testing is most likely to be justified when there is a specific workplace safety reason connected to possible impairment.
Reasonable cause testing
An employer can have grounds to test a safety-sensitive employee when there are objective signs suggesting impairment.
Examples can include slurred speech, poor coordination, the smell of alcohol, observed substance use or seriously unusual and unsafe behaviour.
Suspicion should be based on actual observations, not rumours, stereotypes or assumptions.
Post-incident testing
Testing can be justified after a serious accident or near miss when there is a reasonable basis to investigate whether impairment contributed.
An accident does not automatically give an employer the right to test everyone involved. There should be a meaningful connection between the incident and possible impairment.
Return-to-work testing
Testing can sometimes be part of an individualized return-to-work or monitoring arrangement following substance-dependence treatment or a previous impairment-related safety problem.
The arrangement should be connected to legitimate safety and accommodation needs rather than used as indefinite punishment.
Is Random Drug Testing Legal in Ontario?
Random drug and alcohol testing is heavily restricted in Ontario, and a dangerous workplace alone does not automatically justify it.
Random testing is particularly intrusive because an employee is tested without an individual reason to suspect impairment. An employer seeking to impose random testing generally needs a strong safety justification, including evidence of an enhanced safety risk in the particular workplace.
Simply working in a safety-sensitive position is not enough by itself.
Read our deeper guide to random drug testing in Canada.
What about pre-employment drug testing?
Ontario also takes a restrictive approach to pre-employment drug and alcohol testing.
Testing an applicant simply to determine whether they use drugs or alcohol is difficult to justify. Safety, the nature of the position, the type of testing and human rights obligations all matter.
See our guide to pre-employment drug testing in Canada.
Can You Be Fired for Failing a Drug or Alcohol Test in Ontario?
A positive drug or alcohol test does not automatically give your employer just cause to fire you without severance.
The employer still has to consider what happened, whether the testing was justified, your job and safety responsibilities, what the test actually shows, the workplace policy and whether a disability is involved.
Does a positive drug test prove you were impaired?
Not necessarily. Some drug tests can detect previous substance use without establishing that you were impaired while working.
This can be especially important with cannabis. An employer can prohibit impairment at work, particularly in safety-sensitive positions, but a positive result should not automatically be treated as proof of workplace impairment.
Can you be fired for refusing a test?
Refusing a lawful and reasonable testing direction can create disciplinary risk, but the consequences depend on the circumstances.
If you believe a test is improper, ask the employer to explain:
- Why you are being tested
- What policy authorizes the test
- Whether your position is considered safety-sensitive
- What type of test will be used
Get advice before refusing whenever possible.
Learn more about termination for cause in Ontario.
How Does Addiction Affect Workplace Drug Testing?
Drug or alcohol dependence can be a disability protected by Ontario’s Human Rights Code.
If addiction is connected to a positive test, suspected impairment or workplace conduct, an employer may have a duty to consider accommodation rather than automatically treating the situation as ordinary misconduct.
Depending on the circumstances, accommodation can include treatment-related leave, modified duties or an appropriate return-to-work plan.
Employees also have responsibilities. You must cooperate with a reasonable accommodation process, and an employer does not have to permit dangerous workplace impairment or an accommodation that creates undue hardship.
Learn more about the duty to accommodate in Ontario.
Drug and Alcohol Testing Ontario FAQs
Can my employer drug test me whenever it wants?
No. An employer generally needs a legitimate workplace reason for testing, usually connected to safety, and must respect human rights and employee privacy interests.
Can my employer test me after an accident?
Sometimes. Post-incident testing can be justified after a significant accident or near miss where there is a reasonable basis to investigate whether impairment contributed.
Can my employer randomly test me because I have a safety-sensitive job?
Not simply because the job is safety-sensitive. Random testing requires a stronger justification, and the employer must balance workplace safety against the intrusion on employee rights.
Can my employer fire me because I use cannabis outside work?
Off-duty cannabis use does not automatically establish workplace impairment or just cause for dismissal. The employer can enforce legitimate rules against impairment at work, particularly where safety is involved.
Do I have to tell my employer that I have an addiction?
You should raise the need for accommodation when a disability is affecting your work or compliance with a workplace rule. You generally do not have to provide your entire medical history, but you may need to provide enough medical information to establish your restrictions and accommodation needs.
Get Advice About Drug and Alcohol Testing in Ontario
If your employer is demanding a test, accusing you of impairment or threatening discipline or termination, understand your rights before refusing the test, resigning or signing anything.
If you have already been fired after a positive test or refusal, don’t assume your employer’s allegation of cause means you receive nothing. A non-unionized employee can still be entitled to substantial severance pay in Ontario if the employer cannot establish cause.
The Ontario employment lawyers at Samfiru Tumarkin LLP can review the testing policy, the reason for the test, any accommodation issues and the discipline or termination that followed.