Which police department is linked to Station 30, if it were mentioned?

The assertion that the question is not valid because no Station 30 is mentioned is correct because it suggests that the information required to answer the question accurately is absent. In contexts like police departments, specific stations, like Station 30, typically relate to particular departments based on their geographic jurisdiction or operational structure. If Station 30 has not been established or referenced in the material, it becomes impossible to accurately associate it with a specific police department such as Santa Ana, La Habra, or Buena Park. Therefore, the rationale for this answer is sound, as it emphasizes the requirement for relevant information to make a determination on the relationship between the station and the police department.