The "7th Circuit Upholds Prison Rule Forbidding Inmates to Play Dungeons and Dragons":

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, either in this prison or elsewhere. The only evidence for the supposedly harmful effects of Dungeons and Dragons were a few cases from other states where playing the game supposedly led inmates to indulge in “escapism” and become divorced from reality, one case where two non-inmates committed a crime in which they “acted out” a D&D story-line, and one where a longtime D&D player (not an inmate) committed suicide.