This excerpt taken from the AMZN 8-K filed Jul 24, 2006.
V. Health and Safety
Amazon.com provides a clean, safe and healthy work environment. Each employee has responsibility for maintaining a safe and healthy workplace by following safety and health rules and practices and reporting accidents, injuries and unsafe conditions, procedures, or behaviors.
Violence and threatening behavior are not permitted. Employees must report to work in a condition to perform their duties, free from the influence of illegal drugs or alcohol.