What is the consequence when a player leaves the field of play without permission?

When a player leaves the field of play without permission, it is classified as an illegal substitution. This situation typically arises when a player exits the field but does not do so in accordance with the rules, such as not having a substitute properly replace them or leaving the field when it's not appropriate during a play. The rule is in place to ensure the integrity of the game, allowing for proper player changes while maintaining the flow and safety of the match.

The penalty for this infraction is a 5-yard penalty, which is applied from the previous spot. This enforcement helps to manage team dynamics and maintain fair play on the field. While player discipline is crucial, a 15-yard penalty for unsportsmanlike conduct is reserved for more severe infractions regarding behavior rather than procedural violations like this one. Other penalties outlined, such as those for illegal formation, do not relate to unauthorized exits from the field, further confirming that the 5-yard penalty for illegal substitution is the appropriate consequence in this scenario.