I. BACKGROUND

I.1. THE PARTIES

1. The World Anti-Doping Agency (hereinafter referred to as "Appellant" or "WADA") is an independent international anti-doping agency, constituted as a foundation under Swiss Law and having its headquarters in Montreal, Canada, whose aim is to promote, coordinate and monitor, on an international level, the fight against doping in sports in all its forms.

2. Mr. Jobson Leandro Pereira de Oliveira (hereinafter referred to as "First Respondent" or "Mr. Jobson" or the "Player") is a Brazilian professional football player born on 15 February 1988 in Conceição do Araguaia, Pará, Brazil. Between September and December 2009, he was registered with the Brasiliense Futebol Clube (hereinafter referred to as the "Brasiliense") but was on loan to the Brazilian club Botafogo de Futebol e Regatas (hereinafter referred to as the "Botafogo"), which plays in the Série A of the CBF's Campeonato Brasileiro (in English: Brazilian championship). Since June 2010, the Player has been registered with Botafogo. In January 2011, he was loaned to Clube Atlético Mineiro (hereinafter referred to as "Atlético Mineiro"). However, later in the 2011 season, the Player was loaned to Esporte Clube Bahia (hereinafter referred to as "Bahia"), where he currently plays. All of these clubs are affiliated with the CBF.

3. The Confederação Brasileira de Futebol (hereinafter referred to as "Second Respondent" or "CBF") is the Brazilian football association, governing the sport of football in Brazil.

4. The Superior Tribunal de Justiça Desportiva de Futebol (hereinafter referred to as "Third Respondent" or "STJD") is the highest sports court in Brazilian football.