Company did not discriminate against cocaine addict fired for cause. The Supreme Court of Canada recently ruled that an employer may terminate a worker for just cause when he violated a fitness for duty policy by attending work under the influence of drugs. This landmark decision upheld a ruling of the Alberta Human Rights Tribunal that the employer did not unlawfully discriminate when a worker’s employment was terminated for breach of a safety rule that prohibited a worker from being under the influence of alcohol or drugs at work.