If a home team informs the umpire about using a double first base but the opposing team objects, what is the ruling?

The ruling that the double first base is legal only if adopted by the state association is correct because the use of double first bases in baseball is governed by specific rules that vary by jurisdiction. Each state association may have its own regulations regarding the implementation of the double first base, which is designed to enhance player safety by providing a separate base for the runner to use when approaching first base, reducing the risk of collisions with fielders.

If the home team chooses to implement it but the opposing team objects, the primary concern falls on the compliance with state rules. In this scenario, if the state association has officially sanctioned the use of a double first base, then it is permissible for both teams to use it. Conversely, if the state association has not adopted this rule, then the double first base cannot be used, regardless of the home team's desire to implement it. Therefore, the decision hinges on whether the state association allows for the double first base in the play, making it a legal option based on their rules.

The correct ruling reflects an understanding of regional rules and ensures that both teams are playing under the same regulations, maintaining fairness and compliance with the established standards.