And specifically with respect to the law, breaking a law and claiming you didn't know you did anything wrong as an individual is not considered a valid defense in our justice system. This same type of standard should apply even more to trained law enforcement, not less, otherwise it becomes a double standard.
No this is breaking the law by saying this looked like one of the situations where I already know the law doesn't apply. If Google had looked at the actual image and said it was child porn instead of just saying it was similar to some image that is child porn this would be 100% legal as the courts have already said. That difference is subtle enough that I can see how someone would get it wrong (and in fact I would expect other courts to rule differently)
