Final answer:
The book 'The Truth as Told by Mason Buttle' does not specify the number on Lieutenant Baird's police car.
Step-by-step explanation:
In the book The Truth as Told by Mason Buttle, the number on Lieutenant Baird's police car is not explicitly stated within the text. The details provided in the story are focused on Mason's experiences and do not include specific descriptions of police car numbers. When reading novels such as this one, it is important to pay close attention to the details that are mentioned, as they often contribute to the understanding of the story's characters and plot. However, in this case, the specific number on Lieutenant Baird's police car is not given.