While i have no intention of drawing moral equivalencies: in the US, watching child pornography videos can earn you felony jail time and permanent registration on a sex offenders list. Agree or disagree with the punishment, watching a video resulting in jail time is not without precedent, even stateside.
Aren't there employees at facebook and NSA and the like who have to spend all day looking at material that might be child pornography to verify it is indeed such? Do they have to get special clearance or something so it's guaranteed they'll never be prosecuted for it?
