Tennis star quits after testing positive for cocaine

We tend to idolize professional celebrities for their determination and endurance, so it's pretty disheartening when they test positive for using illicit drugs. The latest celebrity to enter the doping spotlight is Swiss tennis star Martina Hingis. She's tested positive for cocaine -- and the findings have led her to quit the sport.

But her retirement isn't an admission of guilt -- rather, she's vehemently denying the allegations and has chosen to leave tennis rather than deal with the red tape that comes with getting her name cleared.

What do you think of the allegations? Was she too hasty to throw in the towel? Is she guilty?