Stealthy and acting quickly so no one would see him. This is how Xuming Li, PhD student in chemistry, he’s been poisoning his upstairs neighbors. The events have occurred in Tampa, Florida.

His ‘modus operandi’ was as follows: he would go to his neighbors’ door and inject something underneath, using a syringe.

She had complained several times that Omar and his family were making a lot of noise, but none of them ever imagined that she would try to poison them.

The suspicions began after Omar, his wife and their month-old baby They have been feeling bad for a long time. They had migraines, nausea and even their hair fell out, and they also noticed a strange smell in the apartment for which they could not find the cause. After ruling out that it was the air conditioning or the water heater, Omar decided to investigate.

Therefore, he installed a security camera that he hid in a plant and it was thanks to this that he managed to catch Xuming Li red-handed.

The police have found traces of opiates in his apartment, but they do not explain the symptoms that the family suffered. So it is investigated that another chemical could have used.

Li has been arrested for six charges to which, despite the recording, he pleads not guilty.