Tour de France 2016

If there's no cameras or commissaires it didn't happen

That's different, it's taking a wheel from a rival competitor. Martin took a wheel from a team car.

And, as @dubtap says, if the commissaires and/or press didn't see it, it didn't happen.

(On a serious note, usually there are two cars per team in the convoy, but for the Paris stage that is restricted to one, so presumably there is some kind of dispensation which allows other teams to support riders when there sole team car is occupied elsewhere).

@Fox @T-V

Being a helpful chap I have updated Pozzato's Wikipedia page:
https://en.wikipedia.org/wiki/Filippo_Pozzato#Personal_life

I was careful to keep it totally factual. Obviously it's not up to me to interpret someone else's sexuality.