An employer of workers in occupations with high risk of psychological injury must implement a monitoring system that accounts for the foreseeable tendency of workers to minimise or conceal symptoms, and the employer's duty is not discharged by the worker's consultations with external practitioners who do not report to the employer. Where a worker has a pre-existing vulnerability to PTSD that developed independently of the employer's breach, the vicissitudes discount for future economic loss may be increased beyond the conventional 15% to account for the probability that disabling PTSD might have developed even absent the breach. Contributory negligence for concealment of symptoms does not negate the employer's causation but is dealt with by apportionment.
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