A 9-month-old girl has been sick since birth and is diagnosed with Pelizaeus-Merzbacher disease, a genetic degenerative neurological condition with no cure. The diagnosis reveals she was switched at birth, as genetic testing shows her parents are not biological carriers of the mutation.
Also known as: Alcoholism
Dave Walker is a recovering alcoholic who has relapsed after his wife left him. His mother secretly poisons him with coprine-containing ink cap mushrooms to make him violently ill whenever he drinks alcohol, which Sam uses as cover by telling Dave he has developed a rare alcohol allergy.
Also known as: Ink cap mushroom poisoning
Dave Walker and his son Stevie are being poisoned by Dave's mother who is putting coprine-containing ink cap mushrooms in their food. When combined with alcohol, coprine causes severe illness similar to a disulfiram (Antabuse) reaction. The grandmother is doing this intentionally to prevent Dave from drinking.