While scanning the papers, I found an article about a certain Mr. Lam in The New Paper Mr. Lam is a sub-constractor who was hired to take down abestos from the roof of a factory. His workers were provided with safety helmets, safety goggles, gloves, safety harnesses and belts. He was not present at the worksite but had a supervisor to oversee the work done by the workers. Unfortunately, one of the workers stepped on a plastic sheet on the roof that couldn't take his weight and fell to his death.
But, he admitted, that as the boss of the company, he is responsible for the safety of his workers.