General Duty

Section 5(a)(1) of the Occupational Safety & Health Act, often referred to as the General Duty Clause, requires employers to:
furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm to his employees.

This is my profession's mantra: "free from recognized hazards". Closing one's eyes fails to qualify as "I didn't see it".