In this California Court of Appeals case last month, the court ruled that although not everything hanging from a rear view mirror in your car is illegal, a tree shaped air freshener is illegal. As such, it gives police a valid reason to stop you.
The only reason this is posted on the California Business Litigation blog is this:
none of us want to invite a traffic stop.
Throw the air freshener under the seat and have a great new year!
– Richard Oppenheim