Can subcontractor’s employee sue prime contractor for work site negligence after injury?

Q. Our company was a general contractor on a construction job. A subcontractor performed the electrical work. One of the subcontractor’s workers was injured while leaving the construction site. The subcontractor has denied compensability of the workers’ compensation claim, saying that the accident wasn’t within the course and scope of employment. The worker is now threatening to sue us for negligence. Can he do that?