# Poisoning Case Uncovered by Hidden Camera

> California engineer David Xu secretly poisoned co-worker Rong Yuan's water, leading to his felony dismissal after probation.
- Title: Poisoning Case Uncovered by Hidden Camera · Newsweek
- Summary: California engineer David Xu secretly poisoned co-worker Rong Yuan's water, leading to his felony dismissal after probation. David Xu was dismissed from…
- Keywords: david xu, rong yuan, berkeley engineering, cadmium poisoning, felony dismissal, probation, Poisoning, Case, Uncovered, Hidden, Camera, Newsweek
- Source: Newsweek — https://newsweek.com/man-secretly-poisoning-co-worker-caught-camera-12560940
- Published: 2026-10-13T16:01:14+00:00
- Read time: 1 min
- Topics: david xu, rong yuan, berkeley engineering, cadmium poisoning, felony dismissal, probation
## Hidden Camera Evidence
A hidden camera captured california engineer david xu tampering with co-worker rong yuan's water bottle on february 11, 2019.

> my blood was frozen
## Poisoning Discovery
Testing found cadmium at 3.5 million times the federal drinking-water limit in yuan's water, causing her health issues.
## Legal Outcome
Xu completed probation in march 2024 and requested dismissal of his felony poisoning conviction under california's expungement process.
## Court Ruling
A judge granted xu's request to dismiss his felony conviction on october 12, 2024, after prosecutors opposed the motion.
## Key takeaway

David Xu was dismissed from felony poisoning charges after completing probation, following evidence he poisoned co-worker Rong Yuan's water with cadmium.