Determining the relationship between the study drug and an AE requires a practiced power of observation & great care (good medical judgment). Determining if an IMP is subject to liver injury separates the best PI's from the rest.The recent media publicity of the FDA warnings about the OTC drug acetaminophen, which is the most common drug cause for liver transplants has brought into focus the effects of drugs on the liver.Whereas Drug Induced Liver Injury (DILI) is usually a rare event that is not found in the usually approval process, there are clues that all investigators and study staff must know. These will be reviewed in this Webinar.