I have just read an article on „austriantimes.at“ and It talks about the traces of cocaine in the Red Bull coke.
Basically what it says is that the Austrian agency AGES found cocaine in Red bull.Futhermore the Austrian health service said that there was no danger of becoming addicted because ther isn't enough cocaine in the drink.

What surprised me most were the facts that the energy drink lost its status as a foodstuff and became subject to the German narcotics Act and that in nightclubs the demand for Red Bull coke is still increasing.