Generally speaking, in the US, an opposing attorney does not owe you a duty that would give rise to a claim for legal malpractice. To see what your legal options are, consult an Oakland medical malpractice lawyer.Our Oakland, CA, medical malpractice attorneys have some of the highest verdicts and settlements won in Northern California. We offer free consultations. Typically, the case would be initiated in the Superior Court of the county where most of the relevant events took place. First of all, you can't sanction opposing counsel, only the Court can "sanction. " Next, you don't "have" the preponderance of evidence. The Helbraun Law Firm works with victims of legal malpractice in San Francisco, Oakland, Alameda County, Santa Clara County, and throughout Northern California. Fill Out The Form Below For A Free Consultation. Medical Malpractice - Oakland Doctor Malpractice Lawyer.