statutes that protect […] people trying to cooperate with law enforcement,

I don’t know exactly about France, but such a concept is rare in Europe in general (except England), and even more so when it comes to possession of such materials.

In Germany, I know the tolerance is absolutely ZERO, and the excuses too. You can carry the material to the police to deliver it, and with that you have proven that you were in possession one second before (it is very different with illegal weapons btw.). Private investigators or journalists have tried to do reports about the topic, seriously and neutrally without any doubt, but got punished for possession then.