A violation of a safety statute is considered conclusive evidence of negligence when the act breaches a statutory duty intended to protect a specific class of persons or prevent a particular type of harm. This means that by breaking the law itself, one is automatically considered to have been negligent without need for further proof.
For example: If a construction company fails to provide hard hats in an area marked for mandatory head protection by occupational safety laws, this act is conclusively negligent should any employee suffer a head injury from falling debris.