In collegiate football, a specific foul involves illegal contact against a defenseless opponent. This foul typically occurs when a player initiates contact with the crown of the helmet or leads with the head, neck, forearm, elbow, or shoulder to strike an opponent above the shoulders. A defenseless player is defined as one who is in a passing posture, receiving a kick, or otherwise rendered vulnerable. For example, a defensive back launching himself head-first into a receiver who is attempting to catch a pass would likely draw this penalty.
This rule exists to prioritize player safety and reduce the risk of head and neck injuries. The consequences of such hits can be severe, leading to concussions and other long-term health problems. By penalizing these actions, the sport encourages proper tackling techniques and promotes a culture of responsible play. The rule has evolved over time with stricter interpretations and increased penalties in response to growing awareness of the long-term effects of head injuries. This reflects the ongoing effort to balance competitive play with the well-being of athletes.