Stanford student accused of poisoning lab mates

Xiangyu Duyang, 26, a graduate student from Singapore, was captured by a security camera during the time she allegedly poisoned four of her lab mates by contaminating their drinking water bottles with the cancer-causing chemical paraformaldehyde. Court documents say graduate students doing stem cell research in the Lorry Lokey building near the Stanford Medical Center began smelling paraformaldehyde when they drank from their water bottles during September and October of 2014.

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