I was talking to a friend this morning who was telling me of his experience. This is somebody we've known for around 25 years or so and who would not deliberately mislead me. Apparently he bought a 6 berth Carioca a couple of months ago and went on a trip to Italy with his wife and teenage daughter. On the way back, after 7 hours driving and an hour and a half from Calais, they encountered very heavy rain with HGVs speeding past them on the motorway so decided to pull into a MSA to see if the rain eased off. When it didn't they decided to have a couple of drinks and stay the night. No doubt you can guess the rest. First to wake the next morning discovered that they had been robbed so wakes the others and they call the police. They felt groggy (not surprising given the rude awakening) but assumed that they had slept soundly because of such a long drive. First thing the police say is along the lines of "You've been gassed, the thieves carry a canister which they spray through the vents". They had never even thought of gassing as the cause and innocently accepted that explanation as an alternative reason why they had felt groggy. I explained all the stories and asked if the police had arranged medical checks - no medical checks. Also the fact that it would take rather more than a canister of gas to have an effect in such a large vehicle. He saw the logic of that and agreed it is much more likely that their tiredness explained why they weren't awoken by the thieves. It does appear that the French police are using the gassing story to avoid having to investigate thoroughly.