That's like me getting picked up entering Hawaii & saying I was unwittingly used as a courier by organised criminals trying to smuggle the drugs on a connecting flight from Los Angeles to Chicago - just real lame
As is "drug test" exoneration you're fishing for
Look no one buys drugs in quantity with out sampling the goods. If she had a clean test the planted defense would be helped considerably.
It wouldn't be "lame" at all if the plane that she took to Bali flew from Sydney. A quick google search on her name and "Sydney" and "Brisbane" reveals:
http://www.abc.net.au/7.30/content/2005/s1325093.htm
"The group checked their bags in at Brisbane's domestic terminal. At the Qantas counter, Schapelle Corby was instructed to take her bodyboard to the oversize baggage section. With that done, the friends posed for a farewell photo before boarding a domestic flight to Sydney, then on to an international flight to Indonesia. It was in transit in Sydney that Schapelle Corby met up with her friend, Jodie Power, also bound for Bali. The friends were to celebrate the 30th birthday of Schapelle Corby's sister Mercedes."
In other words, she flew from Brisbane to Sydney and thence to Bali. That's not particularly uncommon. I can remember one time when I flew from Detroit to LA via Newark because it was $300 cheaper than any other option.
So you better try to find another piece of "proof" for your claims.
I personally don't know whether or not she's guilty. I do know that there's no way for any of us out here to conclude firmly EITHER way on the matter.