But that gets tricky because you're a human being. Here's a scenario that may well have been what happened in the kiddy porn case. You're looking through a bag and there's an envelope full of pictures. One of them falls out. That picture is of a naked young child. From that picture, you can't tell whether it's an innocent picture of a toddler about to take a bath or potential kiddy porn. Do you look in the envelope at the rest of the pictures to decide what to do? Do you call an LEO? The former is clearly outside of the SOP. The latter is somewhat dubious because the picture in itself is not suggestive of anything illegal. So the line is even finer.