Please note: We are in the process of compiling additional archived Ethics Opinions and will be including them on our website. Contact us to learn more.An attorney has a duty to act competently to protect his or her client's interests until a substitution of counsel is filed or the court otherwise orders. Professional Opinion Letter Form – Fill Out and Use This PDF. Form Preview Example ; I. A lawyer (or solicitor, barrister, advocate, or equivalent) licensed to practice ; la i. The ou try of appli a. Fill it out and mail it to: The State Bar of California Office of Chief Trial Counsel, Intake Unit 845 South Figueora Street Los Angeles, CA 90017-2515.