In a recent decision, the Nova Scotia Workers’ Compensation Appeals Tribunal (WCAT) considered a difficult but increasingly important question:

When does workplace violence in a high-risk role cross the line from “expected behaviour” to a compensable psychological injury?

The answer has significant implications for employers managing staff in education, healthcare, and other front-line environments.

The Background

The worker was employed as an Educational Assistant (EA) in Nova Scotia. In April 2021, she was sexually assaulted by a student under her care during school hours.

The incident was documented the same day through a Reportable Occurrence form. The employer did not dispute that the incident occurred as described.

Months later, the worker began losing time from work and sought psychological treatment. In 2023, she filed a Workers’ Compensation claim for psychological injury.

• The Board accepted the claim.
• The employer appealed.
• The matter ultimately proceeded to the Tribunal.

The Employer’s Argument: “This Is Part of the Job”

The employer made two main arguments.

First, they argued that this type of behaviour was not unusual in the role. Educational Assistants often work with students who display aggressive or unpredictable behaviour. The employer maintained that physical incidents were an inherent part of the job.

Second, they argued that the workplace incident was not the predominant cause of the worker’s condition. The worker had prior trauma in her history. The employer suggested that those past experiences played a significant role in her psychological symptoms.

Under Nova Scotia’s updated psychological injury framework, that distinction matters.

The Policy Shift: A Higher Standard for Psychological Claims

By the time the Tribunal issued its decision, new provisions under Section 10J of the Workers’ Compensation Act and Policy 1.3.10 were in effect.

Under the new framework, a worker must establish:

• A significant work-related stressor, and
• That the injury was “wholly or predominantly caused” by that stressor.

This is a stricter standard than the old material contribution test.

The employer argued that the new standard should apply. The Tribunal agreed. But it also found that even under the stricter test, the worker met the threshold.

Was This a “Significant Work-Related Stressor”?

The employer relied on job descriptions and workplace assessments showing that the EA role can be physically and mentally demanding.

The Tribunal acknowledged that behavioural issues are part of the job.

However, it drew a clear distinction. Managing challenging behaviour is expected. Sexual assault is not.

Policy 1.3.10 specifically recognizes inappropriate sexual conduct and unwanted physical contact as qualifying stressors, when they are significant, compared to normal workplace pressures.

The Tribunal found:

• The incident went beyond routine behavioural management
• The documentation did not establish that sexual assault was an anticipated occupational risk
• The worker credibly explained the difference between routine aggression and what happened during the incident

As a result, the Tribunal concluded that the incident was a significant work-related stressor.

Causation: What Actually Caused the Injury?

The worker did have prior trauma from her teenage years. She had also recently encountered someone connected to that past trauma.

However, the evidence showed:

• She had been functioning well before the April 2021 incident
• She had no PTSD diagnosis before the incident
• Multiple treating psychologists linked her condition directly to the workplace event
• Even the employer’s consulting psychologist agreed the incident met the criteria for a traumatic event

The Tribunal accepted that while past trauma existed, it was not the predominant cause of her disability.

The April 2021 incident met the wholly or predominantly caused test.

The Outcome

The employer’s appeal was denied.

The Tribunal confirmed that the worker sustained a compensable psychological injury arising out of her employment.

What This Means for Employers

This decision offers several important lessons:

1. “Expected Behaviour” Is Not Unlimited Protection

Just because a role involves behavioural risk does not mean all conduct falls within normal occupational exposure. Courts and tribunals will examine:

• Job descriptions
• Training content
• Industry standards
• Whether the conduct exceeds what is reasonably anticipated

Sexual assault was found to fall outside the “normal pressures” of the role.

2. Higher Causation Standards Do Not Eliminate Risk

Even under the stricter “wholly or predominantly caused” test, claims can succeed where:

• Medical evidence is consistent
• The worker was functioning prior to the incident
• The stressor is objectively serious

3. Accommodation Failures Can Complicate Recovery

While the Tribunal focused on the original incident, the evidence revealed ongoing distress related to return-to-work disputes and perceived lack of support.

Even when the initial event is the primary cause, post-incident handling can influence the trajectory of a claim.

4. Documentation Cuts Both Ways

Employers often rely on job site assessments and training manuals to demonstrate expected exposure. But if those documents do not clearly identify specific risks (e.g., sexual assault), they may not support the argument that such conduct is “part of the job.”

Final Thought

Front-line education roles are demanding. Employers know this. Workers know this.

But this decision reinforces an important boundary.

Difficult does not automatically mean compensable.
At the same time, challenging does not automatically mean expected.

Understanding that distinction is critical for risk management, policy development, and how serious incidents are handled when they occur.

Citation: 2026 CanLII 13027 (NS WCAT) | 2024-239-AD (Re) | CanLII