I would like file the subpoena for testimony before I’m assigned an attorney. Is this possible?
Short answer: no. Long answer: it’s theoretically procedurally possible to procure the testimony of an individual’s testimony that is relevant to some pretrial motion through a subpoena before your next court date. But keep in mind that witnesses can typically only be compelled to give testimony about the facts underlying a case at the trial itself. In California, there are generally no compelled depositions before a criminal trial. I would concur with my esteemed colleagues and advise you to let your public defender handle this for you.