During the past 20 years, the frequency of autism occurring in children has skyrocketed from 1 in 10,000 to 1 in 68, and the scientific community is no closer to determining a cause. Trace Amounts is the true story of Eric Gladen’s painful journey through mercury poisoning that he believes resulted from a thimerosal-loaded tetanus shot. His discoveries led him on a quest for the scientific truth about the role of mercury poisoning in the Autism epidemic.