I didn't ask about natural substance use. Am I liable?Dr. Derm recently performed a fairly simple excision, discussed blood thinners, but failed to ask his patient about “natural” herbal intake. The patient did not take any prescription blood thinners, but did take high daily dosages of garlic and ginkgo. A lawsuit was brought against Dr. Derm. Can he really have liability for all the things people ingest these days?