I've just received one of those "There's space for more AdSense earnings on..." emails.
It now says "You can place up to 3 content units per content-rich page" (I cannot recall "content-rich" being in there in the past).
Anyway, one of their suggestions is to add units to a page that contains weapons.
According to their own policies [
support.google.com...]
Sales of weapons or ammunition (e.g. firearms, firearm components, fighting knives, stun guns)
What are you trying to go Google ? Get me banned ?
(Note to self : Never listen to Google advice).