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You should probably contact a criminal lawyer.
Possession (including in your browser cache, so just seeing) of child pornography is a strict liability crime, which means <I didn't mean to see it> is not a defense.
(I have no idea how the moderators who remove it from places like Facebook or 4chan stay out of prison.)
@schratze
@niplav
Child Pornography is basically Langford's Basilisk is what I'm saying.