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Your question and any future similar questions on what is legal outside the Core book can be found in the Additional Resources.
Edit: I also suggest you Read the Guide to Pathfinder Society Organized Play, which would have directed you to the additional resources for your question, and every player should read before getting involved with PFS.
For question not answered in any of the above locations another good place to look is the Pathfinder Society FAQ.
If all three of those fail to answer any PFS questions then the PFS boards are a great resource after looking through those above mentioned resources.