Brett Favre
Former NFL quarterback, best known for his time with the Green Bay Packers, faced a huge scandal in 2010. Nude photographs of Brett Favre surfaced online after he supposedly send them to a NY Jets reporter, Jenn Sterger. Apparently, Favre also sent her explicit texts and left voice messages in 2008 while playing for the Jets.
Favre later admitted to the voice messages, but not the photos. The league fined him $50,000 for not cooperating with their investigation, but otherwise said they had no grounds to discipline him for his personal relationships.
Andreea Răducan
At only 16 years old, Romanian gymnast Andreea Răducan won gold in the 2000 Olympics. However, she got stripped of this medal when tested positive for the stimulant pseudoephedrine. Turns out, this was due to her cold medicine and an ingredient it contained.
Sadly, she never got her gold medal reinstated despite requesting this of the International Olympic Committee back in 2015.