In the 1980s, allegations of ritual abuse at a preschool in Southern California led to the longest, most expensive trial in U.S. history. The McMartin Preschool case — which resulted in zero convictions — became emblematic of a much more widespread phenomenon known as Satanic Panic.
"In Satanic occultism, that which is good is bad. And that which is bad is good. As you view this learning and educational tape, pay attention to notice the reverse of everything that is normal becoming abnormal."
Thus begins The Law Enforcement Guide to Satanic Cults, available for viewing on YouTube under the tag "Occult Hilarity." It's impossible to know if this 1994 oddity was ever used as an actual police training tool (hopefully not), but it's presented matter-of-factly. It features input from "experts" like blatantly homophobic "former Satanic priest turned Christian" Eric Pryor (a fascinating guy in his own right), who interprets graffiti and sets up altars, presumably for the benefit of the wide-eyed police officers who suspected their communities were being overrun by a Satanic menace.
The video offers a glimpse at the context that spawned not just the McMartin trial, which ran from 1987 to 1990, but also at the widespread fear that a battle of good versus evil was raging just below the surface of American culture. Heavy metal songs (and the subliminal and backwards messages supposedly contained therein) and album art, horror movies, and fantasy games like Dungeons & Dragons all offered easy, obvious targets. (As seen in the classic TV movie Mazes and Monsters.)