Disciplinary Records and Warning Letters: How Long Can Your Employer Use Them Against You?

You received a written warning two or three years ago. You put it behind you, kept your head down, and did your job well. Then one day your employer hands you a suspension — and pulls out that old letter to justify the heavier penalty. Is that allowed? Can they really dig up incidents from years ago to make your situation look worse?

The short answer: not always. In Quebec labour law, disciplinary measures don't last forever. A well-established arbitration principle — disciplinary amnesty — recognizes that after a significant period without any repeat offence, old sanctions should no longer be held against workers. This article breaks down how that principle works, what your collective agreement may (or may not) say about it, and how to challenge discipline that leans on incidents too far in the past.

What Is a Disciplinary Measure?

Let's start with the basics. A disciplinary measure (sometimes called a disciplinary action or sanction) is any formal step an employer takes to punish or correct a worker's behaviour. Common examples include:

• Written warning or warning letter (sometimes called a letter of expectation): a formal written notice flagging a problem and warning that more serious consequences may follow if the behaviour continues.
• Written reprimand: similar to a warning, typically placed in the worker's personnel file.
• Suspension: a mandatory unpaid absence from work for a set number of days.
• Dismissal: termination of employment for disciplinary reasons.

Together, these measures make up what's known as your disciplinary record — an internal history that employers can consult when deciding how severely to respond to a new infraction. The principle of progressive discipline holds that each new offence should be treated more seriously in light of prior incidents. That's what makes the disciplinary record so powerful — and it's precisely where disciplinary amnesty comes in.

The Disciplinary Amnesty Principle: Where Does It Come From?

Disciplinary amnesty isn't a statute — you won't find it as a specific article in the Labour Standards Act. It is a jurisprudential principle, meaning a rule developed over decades by grievance arbitrators (the neutral decision-makers who resolve disputes between unions and employers). The core idea is straightforward: if a worker received a disciplinary measure but then behaved without fault for a substantial period, that old sanction should lose its weight as a precedent. Holding it against them indefinitely would be unfair and would undermine the very purpose of progressive discipline, which is to correct behaviour — not to punish indefinitely.

Arbitrators have generally identified three conditions for this principle to apply:

1. A significant amount of time has passed since the earlier disciplinary measure.
2. No repeat offence: the worker committed no similar misconduct during that period.
3. An overall satisfactory record at work since the incident.

In practice, arbitrators tend to find that a measure loses its relevance after roughly 18 to 24 months without recurrence, though this window can vary depending on the seriousness of the original offence.

Important: This principle applies even when the collective agreement contains no explicit amnesty clause. It is part of the general arbitral law recognized in Quebec.

What Your Collective Agreement May Say: Express Amnesty Clauses

Many collective agreements go further than arbitral jurisprudence and include an explicit amnesty clause — a provision that spells out exactly how long a disciplinary measure can remain active in a worker's file. These clauses are among the most worker-friendly provisions in a collective agreement, and they're often a hard-won product of collective bargaining.

What Does an Amnesty Clause Look Like?

Exact wording varies, but here is a typical example:

"Any disciplinary measure shall be removed from the employee's file after a period of twelve (12) months without any further disciplinary measure. After that period, the said measure may not be invoked by the employer when assessing new sanctions."

Some agreements set different timelines depending on the type of measure:

A Concrete Example

Imagine your collective agreement includes an 18-month amnesty period for written warnings. In March 2022, you receive a warning letter for unexcused absences. In October 2023, you have a conflict with a coworker, and your employer wants to suspend you for two days — citing, in part, the 2022 letter to justify the heavier penalty. The problem: 19 months have elapsed since that warning with no further disciplinary action against you. Under the amnesty clause, that letter is wiped from your active disciplinary record. The employer can no longer use it to increase the severity of the 2023 sanction. Your union representative can file a grievance — a formal complaint under the procedure set out in your collective agreement — to challenge the suspension as disproportionate once those prior incidents are excluded.

When the Collective Agreement Is Silent: The Default Principle

If your collective agreement contains no amnesty clause, all is not lost. Quebec arbitrators apply the jurisprudential principle described above as a default rule — one that fills in the gaps left by the agreement.

In these cases, arbitrators look at:

• How much time has passed between the old measure and the new offence.
• The nature of the offences: are they related? An old warning for repeated lateness carries less weight when the new offence involves a safety violation, and vice versa.
• Changes in behaviour: has the worker received positive performance reviews, promotions, or commendations in the meantime?
• The employer's good faith: is the employer pulling out an old file purely to inflate a sanction they know is otherwise too light?

What This Means in Practice

If your employer dismisses you by pointing to incidents four or five years old on which no follow-up discipline was ever imposed, an arbitrator may reduce or even overturn the dismissal — concluding that those prior incidents have lost their probative value. It's not automatic, but it is a strong argument in your union's hands.

How Employers Can Still Invoke Your Disciplinary History

To be honest, disciplinary amnesty has real limits. There are situations where an employer can legitimately reach back into the past.

Serious or Exceptional Misconduct

Arbitrators generally treat serious misconduct differently — physical violence, theft, sexual harassment, dangerous conduct. An old sanction for violence can remain relevant much longer, even beyond the usual amnesty window, especially when the new offence is of the same type.

Not All Measures Are Covered

Some collective agreements expressly exclude certain categories of offences from amnesty. Read the full clause carefully: the exclusion is sometimes tucked into a subsection that's easy to overlook.

Historical Context vs. Formal Precedent

In a dismissal case, an employer can sometimes describe a worker's general track record without formally invoking a prior measure as a stepping stone in progressive discipline. Arbitrators draw a distinction between using an old measure to increase a sanction (which amnesty prevents) and simply painting a broader picture of the employment relationship.

The Letter May Still Be in the Physical File

Keep in mind: amnesty means the measure can no longer be used against you, not necessarily that it disappears from the physical personnel file. If your collective agreement specifically requires physical removal, great. Otherwise, the letter may still sit in a folder somewhere — but the employer cannot rely on it to justify a heavier sanction.

How to Challenge Discipline Based on Stale Incidents

If you believe your employer imposed a sanction by improperly relying on outdated disciplinary history, here's how to respond.

Step 1: Gather the Evidence

• Request a full copy of your disciplinary file from your employer. You have the right to access it.
• Note the date of each measure and calculate how much time has passed.
• Gather any positive performance reviews, merit increases, or recognition letters you received in the interim.

Step 2: Review Your Collective Agreement

• Search for keywords: "amnesty," "removal from file," "disciplinary record," "expiry of measures."
• Note the timelines specified and any exclusions.
• If you find no clause, the default jurisprudential principle may still apply — your union can argue it.

Step 3: Contact Your Union Representative Immediately

Deadlines to file a grievance are typically short — often 15 to 30 days from the date you receive the disciplinary measure, depending on your collective agreement. Don't let that window close. Your union representative (sometimes called a shop steward) is your first point of contact. They'll assess whether a grievance is warranted and launch the process.

Step 4: The Grievance and Arbitration Process

If the early steps of the grievance (direct discussions with the employer) don't resolve the issue, the union can take the file to grievance arbitration — that is, before an independent arbitrator with the power to cancel or modify the sanction. The arbitrator will evaluate, among other things, whether the progressive discipline applied was justified given the contested prior incidents.

What Labour Standards Legislation Says (and Doesn't Say)

In Quebec, the Act Respecting Labour Standards (ARLS) protects workers against dismissal without just and sufficient cause (section 124 ARLS, which applies to non-unionized employees with two or more years of continuous service). In a unionized workplace, it is the collective agreement and the Labour Code that govern discipline — the ARLS plays a secondary role.

The ARLS also prohibits reprisals against a worker who exercises a right under the statute (section 122 ARLS). If you believe a disciplinary measure is actually retaliation for filing a complaint or asserting a legal right, that's a separate avenue worth exploring with your union.

In federally regulated workplaces — sectors such as interprovincial transportation, banking, and telecommunications — the Canada Labour Code provides comparable protections against unjust dismissal, and federal arbitrators apply disciplinary amnesty principles drawn from the same underlying logic.

Key Takeaways

Here is a summary of the most important points:

• Disciplinary amnesty is a real and recognized principle in Quebec arbitration, even without an explicit clause in your collective agreement.
• Collective agreements can go further by setting precise timelines — always read your agreement carefully.
• The typical window recognized by arbitrators in the absence of an explicit clause is around 18 to 24 months without a repeat offence.
• Serious misconduct (violence, harassment) may be treated differently and given a longer relevant window.
• Act quickly: deadlines to challenge a disciplinary measure are strict and easy to miss.
• Your union representative is your most important ally throughout this process.

Find Out What Your Own Collective Agreement Says — With Konvention

Your collective agreement is unique. Amnesty timelines, excluded offences, and grievance procedures vary widely from one union to the next, from one industry to the next. What you've read here gives you the general framework — but the real answer for your specific situation is in your own negotiated text.

Do you have a question about your disciplinary record? Want to know whether an old warning letter can still be used against you? Ask directly on Konvention: our tool analyzes your collective agreement and gives you a clear, grounded answer based on your own provisions. Because knowing your rights is already half the battle.