# Poison case dismissed: Judge wipes record of scientist caught on camera poisoning coworker

> Judge dismisses scientist's poisoning conviction after spy-camera videos reveal attack on coworker.
- Title: Poison case dismissed: Judge wipes record of scientist caught…
- Summary: Judge dismisses scientist's poisoning conviction after spy-camera videos reveal attack on coworker. Judge dismissed David Xu's poisoning conviction after he…
- Keywords: david xu, rong yuan, alameda county superior court, poisoning, probation, spy-camera videos, cadmium, news, local, Poison, case, dismissed
- Source: The San Francisco Standard — https://sfstandard.com/2026/10/13/poison-case-dismissed-judge-wipes-record-scientist-caught-camera-poisoning-coworker
- Published: 2026-10-13T23:19:46+00:00
- Read time: 1 min
- Topics: david xu, rong yuan, alameda county superior court, poisoning, probation, spy-camera videos, cadmium, news, local
## Poisoning case dismissed
Judge dismissed David Xu's felony poisoning conviction after he completed probation.
## Spy-camera videos revealed attack
Rong Yuan shared spy-camera videos of David Xu poisoning her with cadmium.
## Xu served short sentence
Xu served one day in jail and two years of probation despite facing up to life in prison.
## Poisoning caused health issues
Yuan suffered vomiting, hair loss, and health problems until she discovered cadmium poisoning.
## Yuan's family affected
Yuan's father died of heart failure after being poisoned by water tampered with by Xu.
## Xu's dismissal petition
Xu completed probation in March and filed for dismissal in July after state law allowed it.
## Yuan's statement
Yuan said the ruling was expected but she was disappointed, stating her father died without seeing justice.
## Key takeaway

Judge dismissed David Xu's poisoning conviction after he completed probation, allowing him to avoid disclosing the crime to employers.