Alameda County Superior Court Dismisses Felony Conviction of Former Berkeley Scientist Following Probation Completion

An Alameda County Superior Court judge issued an order on Tuesday formally dismissing felony poisoning charges against former Berkeley materials researcher David Xu following his successful completion of a court-supervised diversion and probation program. Judicial records show that the 41-year-old engineer satisfied all terms of his plea agreement, including financial restitution payments, psychiatric counseling evaluations, regular drug screenings, and two years of formal probation without a single compliance violation.

The legal matter dates back to 2019, when coworkers at an engineering consultancy laboratory in Berkeley noticed unusual chemical odors in their drinking water vessels, prompting laboratory security cameras to record Xu tampering with an office water bottle. Investigators subsequently identified traces of cadmium in the water samples, resulting in criminal charges and Xu's immediate termination from the research firm. Under California penal statutes, defendants who enter plea agreements with deferred entry of judgment can petition for formal case dismissal upon meeting stringent behavioral and rehabilitative benchmarks established by presiding judges.

Court filings presented during the morning hearing confirmed that Xu complied with all court-imposed stay-away directives, completed community service commitments, and submitted verification of ongoing mental health treatment. Deputy district attorneys reviewed the compliance documentation and acknowledged that statutory requirements for expungement had been fully satisfied under state judicial guidelines. Presiding judicial officers affirmed that the legal disposition reflects standard California criminal justice protocols governing completed felony probation terms.

Legal scholars and criminal defense attorneys noted that statutory expungements allow individuals who complete rigorous supervision to rebuild professional standing while ensuring community accountability measures are fulfilled. Former research colleagues acknowledged the resolution of the lengthy proceedings, expressing appreciation that workplace safety protocols and internal chain-of-custody measures across regional commercial laboratories were substantially strengthened in the aftermath of the original incident. The court confirmed that all civil, restitution, and criminal oversight requirements connected with the case have now officially concluded.

Members of the public seeking official case dispositions or information regarding county court diversion proceedings can consult the Alameda County Superior Court public records registry at alameda.courts.ca.gov. Certified court documents and hearing transcripts remain accessible through the clerk's office at the René C. Davidson Courthouse in downtown Oakland during standard operational hours.