This document discusses contractor safety and the legal duties owed to contractors. It provides examples from case law that establish that while principals cannot delegate their health and safety duties, they can fulfill them by ensuring contractors are competent. Principals are generally not liable for incidents caused by a contractor's work methods when the contractor is in control. The document advises principals to demonstrate due diligence in contractor selection, clearly define responsibilities, and not assume control over contractor work or safety systems unless issues arise.