Waymo halts San Francisco ride after detecting ghost gun, leading to juvenile arrests

Key points

On September 3, just before 4 a.m., a Waymo robotaxi in San Francisco’s Outer Richmond neighborhood detected a violation of its terms of service involving a firearm.

Waymo employees pulled the vehicle over and contacted the San Francisco Police Department (SFPD).

SFPD conducted a high-risk vehicle stop and arrested two minors, a boy and a girl, whose identities were withheld due to their age.

Officers recovered an AR-style 'ghost gun' (a weapon lacking a serial number), suspected marijuana, and mace spray from the vehicle.

The arrested individuals were booked into San Francisco’s Juvenile Justice Center.

This incident follows a July incident where Waymo reported two 15-year-olds for drinking and shooting Orbeez water beads from a vehicle in San Mateo.

Background

Waymo has recently expanded its operations significantly, including approval to operate across 18 California counties and new public launches in Denver. The company has also faced scrutiny for other incidents, such as a vehicle nearly hitting a toddler in Noe Valley and a Fourth of July incident involving fireworks. This latest event highlights ongoing challenges regarding passenger behavior and safety protocols in autonomous ride-hailing services.

How outlets are covering it

USA TODAY and SFist both confirm the core facts: the September 3 incident, the detection of the ghost gun by Waymo, and the subsequent arrest of two minors by SFPD. SFist provides additional detail on the location (40th Avenue, Outer Richmond) and the booking of the suspects into the Juvenile Justice Center. The Independent’s coverage is largely obscured by technical metadata in the provided source but confirms the headline narrative of Waymo pulling over the vehicle due to the assault rifle. All sources agree that Waymo’s detection system triggered the police response, marking a pattern of the company acting as a first responder for safety violations.

Why it matters

This incident underscores the evolving role of autonomous vehicle companies in public safety, where algorithms can detect illegal items and trigger law enforcement responses. It also highlights the specific risks associated with 'ghost guns' and the potential for minors to access and misuse autonomous transportation services. The recurrence of such incidents raises questions about Waymo’s vetting processes and the broader implications of expanding robotaxi services in urban areas.

What to watch

The case will proceed through the juvenile justice system. Waymo may face increased scrutiny regarding its safety protocols and passenger vetting. The company is expected to continue its expansion across California and other cities, but this incident may prompt further regulatory review or internal policy changes to prevent similar occurrences.