Soldato
They had to come up with some reason.
They either say, "We didnt want other teams to find out that we were using the 2013 car, along with the 2013 drivers, to get additional testing miles on a car which shredded its tyres at an unprecedented rate."
OR they make up a story, and use "security" as the reason for using unmarked helmets.
Merc knew exactly what they were doing and decided to go ahead with the test anyway - remember, this test was on the day after the Spanish GP - a GP where they qualified in pole and went backwards at an astonishing rate.
Take a look at this interview with Rosberg, after the race
http://www.youtube.com/watch?v=2SM4201rpX8
He is completed perplexed on why the car is shredding the tyres. Hamilton had no idea either. Neither did the team.
Merc desperately needed additional test data. Any data would've helped them.
Brawn is a smart guy - more than you or I - and to suggest that he'd be foolish enough not to know the in-season testing rules with the current car, is nonsensical.
Thanks for the info, I did already know all of that though
Ross knows he won't be around at Mercedes forever with all their personnel shuffling, probably doesn't care too much which way it goes for Mercedes in the long term because of this and probably thought it was worth taking the gamble with the test. He knew it wasn't declared legal by the relevant authorities and that it could end up like this, at the Tribunal.
He may have thought that the car is so **** anyway (in terms of deg) that it was a risk worth taking adopting the "do or die" mentality... I firmly believe that their tyre deg issues are mechanically induced and that they have gathered relevant data from the 1000km worth of testing in a desperate bid to rectify this. A tribunal was worth the risk, a flimsy note and a phone call from Charlie Whiting he felt was evidence enough, but perhaps it left something to be desired in terms of his risk assessment.
Brawn has even said today...
As a rebuttal to that, the FIA's lawyer asked whether they gained 'knowledge' from that. Ross Brawn didn't want to answer that but was pressed on the point and did have to concede they did gain 'knowledge' from the test.
Merc will most likely get a hefty fine, but they'll recover that money back by having an advantage over the other teams and finishing ahead in the WCC and WDC than they would have had they not took part in the test.