The bosses have always known there are cancer causing agents in the work place.  They don't care.  It's profit first.

Fact is the government must regulate this.   There are plenty of people who are desperate for money for food and corrupt people take advantage of them forcing them to work in dangerous conditions.

Unfortunately the government and ministry of labour is in the pocket of the big constructors.     In 2004 I was on a site were the demolition company was ignoring the asbestos and scattering it around.  An employee from our company called the ontario ministry of labour anonymously.  Unfortunately he used his cell phone.  The ministry called the constructor and told them about the complaint and the name on the phone number.

The guy was laid off next day.