Unreported / Non-Citable
Background
On June 4, 2022, South San Francisco police responded to a large sideshow of roughly 100 vehicles and 200 pedestrians. Sergeant Chris Devan noticed Tyler Taintergallon near a white Mercedes backed into a handicapped stall at a gas station where many spectators had parked. After Taintergallon and a companion approached the car, walked away, and returned, Devan suspected he did not want to be associated with it and ran a records check showing the plate was registered to a Chevrolet, leading him to suspect the Mercedes was stolen.
Officers conducted a high-risk traffic stop and handcuffed Taintergallon. When he said the car was registered in his name, Devan acknowledged he might have misread the plate and requested a second check. Meanwhile Taintergallon gave false identification and admitted it was fake. While retrieving his wallet, Officer Hector Sanchez moved a satchel covering his pocket, felt a handgun, and searched the bag, finding a loaded Glock 9 mm. Taintergallon was arrested; the second check confirmed the Mercedes was registered to him.
Taintergallon was charged with felon in possession of a firearm, unlawful ammunition possession, and possession of a forged license. The trial court denied his suppression motion, finding a reasonable good-faith mistake on the plate and reasonable suspicion from his presence at the sideshow. It later denied his mental health diversion application under Penal Code section 1001.36, finding clear and convincing evidence that his schizophrenia was not a significant factor and that he was unsuitable. He pleaded no contest to the firearm count, admitted a prior strike, and received a suspended three-year sentence with two years' formal probation after the court struck the strike.
The Court’s Holding
The Court of Appeal affirmed the suppression denial. It declined to decide whether sideshow presence alone justified detention because Taintergallon was not detained until the traffic stop, by which time the records check suggested a stolen vehicle. He did not dispute that the first check—even on the wrong plate—gave reasonable suspicion, nor argue the misreading was objectively unreasonable. The court rejected the claim that Devan's acknowledgment of a possible mistake showed negligence or subterfuge, deferring to the trial court's credibility findings and its express finding of a reasonable good-faith mistake.
The court upheld the satchel search as a lawful search incident to arrest. At the time, Taintergallon had consented to a wallet search, given false identification, and admitted it was false, supplying independent probable cause for a custodial arrest; a search incident to arrest may precede the formalities of arrest. His reply brief's silence on the point was treated as a concession.
The court declined to review the diversion denial because Taintergallon neither sought nor obtained a certificate of probable cause under Penal Code section 1237.5. The application was denied five months before his plea, and successful diversion would have dismissed the charges, so the challenge was not a post-plea matter. Relying on People v. Braden and related decisions, the court held a pre-plea diversion challenge requires a certificate, and a properly appealable suppression claim does not allow adding certificate-requiring claims.
Key Takeaways
- A records check mistakenly linking a plate to another make can support reasonable suspicion for a stop if the mistake was reasonable and in good faith.
- An officer's admission that he may have misread a plate does not prove he knew the check was wrong before verification.
- A search may be incident to a lawful custodial arrest when independent probable cause exists, even if formal arrest follows the search.
- After a no contest plea, challenging a pre-plea mental health diversion denial requires a certificate of probable cause.
- A properly appealable suppression claim does not let a defendant add unrelated claims that require a certificate.
Why It Matters
The decision applies settled Fourth Amendment doctrine to a stop prompted by an erroneous plate check, stressing deference to trial-court credibility findings, and confirms that search-incident-to-arrest can validate a search made just before formal arrest when probable cause already exists.
It also clarifies the appellate effect of a no contest plea following denial of mental health diversion: because diversion is available only until adjudication and success would have erased the charges, a challenge to its denial affects the plea's validity and requires section 1237.5 compliance. The court did not reach the diversion ruling's merits.