>>. . . and you cannot be the arbiters of what is legal or not legal. Maybe point that out as well. <<

This of course risks chilling privacy rights. If the powers that be object to its ambiguity and breadth, then you can even provide a nonexclusive list of examples of what may prompt reporting, which will serve to focus you on areas such as child porn, as opposed to something more political. "Such as a claim or other evidence that images of minors in a state of undress were accessed." (You get the point.)