In order to find out if you are eligible for traffic school, you will need to contact the court in the county where you received your ticket. They will let you know whether you are able to take a traffic school course in CA or if you will have to take one in AZ. You should be able to find their contact information on the ticket.
Radar cameras have been taken out of service in some counties of AZ becasue of reliability concerns. This increases the chances you can get your ticket thrown out. It's worth paying for a lawyer.
Traffic camera radar have been dismantled in some AZ locations due to public pressure. Call a local lawyer in your area for details.
You might find my Legal Guide helpful "How to Choose A Lawyer For You"
You might find my Legal Guide helpful " What Do I Tell My Lawyer"
Good luck to you.
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