No. It is Formisano that is being contradictory not the BBC whose article talks of a tentative detection of ammonia.

I hate to say it but there are a lot of interesting comments about formisano and ammonia on Richard Hoaglands site (read the ammonia stuff only - the rest is rubbish).

In his Cospar report Formisano said that the PFS could look for trace elements like ammonia, he also said the same to Linda Mouton Howe.

Look at this spectrum...

http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34633

do you see a 'tentative' detection of ammonia?

The rumour from Ischia is that there is a paper in the works about ammonia.

I also was told that the BBC story was an inside leak by the PFS team who showed them the spectra among other things - and that Formisano was annoyed his team had leaked the news.