Dr. Max DeBryn:  Pending toxicological results , I consulted a colleague from the Botanic Gardens . He identified the leaves in the teapot as having come from Datura stramonium .
DC Endeavour Morse: Datura ?
Dr. Max DeBryn: A weed . Also known as the Thorn Apple or Devil 's Snare .
DI Fred Thursday: Poisonous ?
Dr. Max DeBryn: Oh highly toxic . The seed pods in particular . I took the liberty ... Been used for centuries by the Indians and Chinese as a treatment for Asthma . But the line between a medicinal and a lethal dose is very thin indeed . Contains atropine and scopolamine .
DI Fred Thursday: The " truth " drug ?
Dr. Max DeBryn: That 's right . Taken in an overdose , symptoms include severe hallucinations , seizures , all leading step by jolly step to blindness , coma and an eventual " how do you do " from St. Peter . If _ one _ goes in for that sort of thing .