There's no legislated standard in the US, nor pre-sale verification that a vehicle has met most of the other automotive standards. That's just not how the US regulatory environment works.

There's the beginnings of a standard for L2/L3 vehicles in Europe, and ongoing discussions about what L4 standards could look like, but neither addresses "adversarial" situations.

China is going for what's sometimes called "L3.5" - hands off wheel, eyes off road, driver may have to take over if alerted, but if the driver doesn't, the vehicle must safely stop and pull over if possible.

The trouble with "driver assistance" systems is the handoff to the driver. That's not reliable. Results from the aviation community indicate that it takes about ten seconds after an autopilot disconnect before the pilot has stable control of the aircraft. "L3.5" accepts that. The < 2 second response required by some L2 systems does not.