Investigators in San Mateo County use license plate technology to break open copper theft case
San Mateo County, California – A sweeping investigation into a string of copper cable thefts across San Mateo County has led to the arrest of a Union City man, as authorities continue working to protect communications infrastructure that serves communities across the Peninsula.
The case centers on a series of thefts reported between Feb. 1 and March 18, 2026, in areas under the San Mateo County Sheriff’s Office, including Half Moon Bay, La Honda, Portola Valley and Woodside. During that stretch, investigators documented 11 separate incidents involving telecommunications infrastructure. In total, about 2,800 feet of copper wire was stolen, with losses estimated at more than $225,000.
The investigation intensified after another theft was reported early on March 23 in the 4000 block of Sand Hill Road in Woodside.
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According to the Sheriff’s Office’s press release, deputies responding to that incident were able to identify a suspect vehicle using Automated License Plate Reader technology. Detectives, who had already been following leads tied to the broader theft pattern, then tracked the vehicle to a scrap metal facility where the stolen copper had been sold.
With assistance from the facility, investigators identified the suspect as 53-year-old Michael Galbreath of Union City. The following day, March 24, officers with the South San Francisco Police Department located and stopped Galbreath’s vehicle. Sheriff’s Office detectives responded to the stop and took him into custody.
Authorities said a search of the vehicle turned up additional copper cable along with other evidence, illegal drugs, drug paraphernalia and ammunition. Because Galbreath is a convicted felon, he is not legally allowed to possess ammunition. He was booked into the Maguire Correctional Facility on suspicion of felony grand theft of copper materials, along with additional alleged violations of the Penal Code and Health and Safety Code.
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The San Mateo County District Attorney’s Office has since filed charges. After his first court appearance, Galbreath was released on his own recognizance. The Sheriff’s Office noted that it does not set the bail schedule.
Sheriff Ken Binder said the arrest reflects both sustained investigative work and cooperation across agencies.
“We recognize how disruptive these crimes can be for our community and we are committed to addressing copper theft,” said Sheriff Ken Binder.
“This arrest is the result of great police work combined with interagency collaboration and the effective use of technology.”
Even with an arrest made, investigators say the work is not over. The Sheriff’s Office is continuing to pursue leads in the case and is increasing attention around locations where telecommunications infrastructure may be vulnerable.
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Residents are being urged to stay alert around utility poles, roadside boxes and construction zones, and to review surveillance footage if they believe it may capture suspicious activity. Non-emergency tips can be reported to the Sheriff’s Office at 650-363-4911, while emergencies should be reported by calling 911. Anonymous tips can also be made at 1-800-547-2700.
