Pennsylvania is well known for this nonsense.
As many of you may know, I am in the SCA (
http://www.sca.org), a huge international Medieval Re-enactment group. Each year, in August, about 10,000 SCA folks gather near Butler, PA for "Pennsic", a week long Medieval War, complete with encampments, merchant areas, classes, archery, fencing, and medieval fighting.
The site issues a rear-view mirror parking tag. Which, you *must* have there to prove you paid, etc.
The PA cops just love to sit a quarter mile from the site, especially on the last day of, and pull people over and cite them for having something (the tag) hanging from their rear-view mirror...because most folks forget to take them off as they leave the site.
Crooked, indeed...