[Texas_Jarhead]

"The officer said he got the packets from a anti-gang training course he took. Officials say he neglected to take out the adult material."

That makes no sense to me.

[Strategerist]

Here's my guess:

The Anti-Gang course was done by a religious group and included a lot of the typical hype of Satanism and included their ideas of "Satanic" material, including this calendar that they did themselves, and it got left in the material he handed out.

[WildTurkey]

That makes no sense to me.

Anti-gang training provides you with examples of material that may be associated with gang activities.