It is illegal to drive down the highway with an uncaged bear in your car.

The Law

Riding shotgun with a grizzly might sound like a fun road trip to some, but Missouri law explicitly forbids transporting an unrestrained bear in a motor vehicle. This is part of a broader set of regulations regarding the transportation of dangerous wild animals. The law ensures that dangerous predators don't cause massive highway pileups by distracting the driver or escaping.