I found this cool old CHP publication on the Vintage American Motorcycles website. The crude art work is both funny and an interesting view on how the CHP viewed choppers. I'm guessing a CHP officer drew it. The publication is probably from around 1970 and is available as a download. It has valuable information on how to detect bad numbers. On the other hand, you might say it tells thieves what and what not to do.
Some of the stuff in the glossary is amusing and really has nothing to do with the rest of the pamphlet. It's funny to see what definitions they chose to put in or left out (like Panhead). It really should have been titled as a glossary of Outlaw Terminology as opposed to Motorcycle Terminology.