Neighbor from hell Xuming Li allegedly contaminated the Florida family's doorstep with so much 'chemical agent' their baby got sick.
The recent University of Southern Florida graduate was caught on camera after the family planted a hidden lens in a potted houseplant outside their home.
Shocking footage shows him loading up a syringe, before crouching down and appearing to inject a clear substance beneath the door.
Umar Abdullah, who lives in the Tampa home with his wife and baby daughter, said he was shocked by Li's behavior because he seemed like a 'regular guy'.
Abdullah moved into the condo with his pregnant wife in June 2022 and they were warmly welcomed by other residents in the building.
However, he soon began receiving texts from his disgruntled downstairs neighbor, Li, who lamented over losing sleep and hearing the toilet seat move.
After months of complaints, Abdullah said he, his wife and daughter began feeling sick and dizzy.
'I look at my daughter,' Abdullah told WTLA. 'Her eyes were full of tears. She was not crying, but her eyes were full of tears.'
The family were baffled about what was causing their mystery illness, until a friend visited and pointed out an 'obnoxious' smell in their home, Abdullah said.
He began investigating, starting by calling his air conditioning company, who found no issues.
Abdullah then called a plumber, believing the smell to be coming from his water heater - but that also came out clear.