I'm checking for a relative who is getting ready to turn 18. I've had a CHP for a few decades, and this law is only a half dozen years old, so I've not had to worry about it before. And yes, he's safe, upstanding, respectful, and an exceptional shot, so I'd not have any qualms with him being armed where legal.
As the relative will be under 21, a CHP is not an option for now. The law requires the firearm to be "properly secured in a container or compartment within the vehicle" (ie glove box, center console, trunk, etc). The container/compartment does not have to be locked, the firearm may be within the reach of the driver or a passenger, and the firearm may be loaded."
Everything I've uncovered during my research has only listed the glove box or center console as acceptable compartments within the vehicle. I have not seen any clear reference to a "container" and what that may be.
Per my layman's understanding, it sounds to me as though a separate pistol case or "container" could meet the intent of this law. Is that a correct interpretation, or is the container intended to be an integral part of the vehicle as the compartments that are listed are? If the latter, could a mounted pistol safe (under the seat for example) then be acceptable?