The Volokh Conspiracy:  “the 7th Circuit Court of Appeals has upheld a Wisconsin prison’s rule forbidding inmates to play Dungeons & Dragons or possess D&D publications and materials  . . . .  The prison’s rationale for the ban is that playing D&D might stimulate ‘gang activity’ by inmates.  But the government conceded that there is no evidence that Dungeons and Dragons actually had stimulated gang activity in the past,”