I live in Paris. Just got a 200€ fine coming back from a running session. Beware, RATP rule enforcers are now dressed as civilians and targets gullible individuals who breaks stupid rules, (mistook my pass with my credit card when i tried to check-in : 50€ for forgetting my pass, and 150€ for entering an quasi-empty bus by the middle door). I see why RATP resorted to racketeering after all this over-budget fiasco. Hope it's worth it.