On the AMA D37 message board (Off-Road motorcycle racing) here in SoCal there was a post yesterday about non-CARB compliant gas cans and the California Highway Patrol (CHP).
The CHP is pulling people over with visable fuel containers and citing those that are non-compliant! The problem appears related to how the cans are sealed. If you have a sealed lid/cap with no spout or hose you are probably OK...Maybe? But if you have a spout, hose, or the can seeps, you will be cited. It makes no difference if you have a cap or valve on the spout or hose because it must be self closing to meet carb rules.
I called one my buddies who is CHP, he confirmed this is happening and was not sure what the ticket costs, but said it could be quite expensive depending on circumstances. He also said they can cite for having fuel in non-rated containers.
For those that have lots of fuel cans hanging on their rigs, pay attention to how they are secured and sealed.
Doug