We have driven through France many times and stayed there for a couple of months in 2010 and I have never heard of drivers having to have their own breathalyser or time checks being carried out on tolled motorways. Is this something new and where did you get this info dereko1969?
No, however in France you need to have your own breathalyser, I believe the ferries sell them on board. You will also need a hi-vis jacket and a warning triangle.
Also remember on some of the tolled motorways they will check your end to end time and you may be fined for exceeding the speed limit.