Estate Planning, Trust and Probate Law - For California's Board Certification program the term "estate planning, trust, and probate law" is the practice of law that includes multiple areas, for instance, creating a will or trust, and protecting assets. A trust and estate attorney who applies for board certification in California must demonstrate that within the specified period he or she has been substantially involved in the practice of estate planning, trust, and probate law. Furthermore, an attorney who is a certified specialist has demonstrated proficiency in this specialized field of law.