What is soda doing while the police are interviewing ponyboy?

You're likely referring to the novel "The Outsiders" by S.E. Hinton.

In the book, Sodapop Curtis is not present during Ponyboy's police interview. He is at the hospital with Darrel (Darry) and Johnny, who are both injured.

Let me know if you have any other questions about "The Outsiders" or any other topic!