A federal appeals panel in the US has asked a district judge to decide whether it's unconstitutional for South Dakota to impose a statewide ban on porn in prisons. The issue was raised by an inmate who was prohibited access to seemingly innocuous items, because the prison deemed them "pornography," including a yoga magazine, images of classical nudes from Michelangelo, and manga. The ACLU South Dakota and the National Coalition Against Censorship filed joint amicus briefs decrying the ban.