Tennis complies with the World Anti-Doping Authority's code, which recommends a two-year ban for possession of prohibited substances.
Like the proposed CW ban, it is supposed to prevent any nation from obtaining and stockpiling quantities of the prohibited substances.
"The doctor assured me that no prohibited substances were in the medication, " Koubek wrote in his diary on the www.tennisweb.at website.
BBC: Koubek claims he did not knowingly take banned substances
Both players have tested positive for methylhexaneamine, a "non-specified stimulant" on the prohibited substances list of the World Anti-Doping Agency (Wada).
In a 2005 appeal, a panel composed by the international Court of Arbitration for Sport found that Testis compositum couldn't be proven to possess prohibited substances.
The fight against the use and the trade of prohibited substances and methods is today the main challenge to curb the scourge of doping in sport globally.
Al Zarooni, who has admitted using the banned substances in error, faces charges relating to the use of prohibited substances, keeping medication records and conduct "prejudicial to horse racing".
This universal international treaty stipulates that governments should adopt measures to restrict the availability of prohibited substances and methods in order to reduce illegal use by athletes (Article 8).
The International Federation of Horseracing Authorities, or IFHA, is examining whether to recommend a total ban on administering steroids to horses, according to Roland Devolz, the IFHA's technical adviser on prohibited substances.
"Having worked with ASADA for the past five years it was very clear that there were links between elements of organized crime importing and distributing prohibited substances across Australian sport, " Ings told CNN.
But IFHA recommendations are ratified by each country member and Devolz said the body would publish the names of the countries that were unwilling to sign off on rules banning prohibited substances during training.
On top of that, the league and the union for the players added 45 performance-enhancing substances and stimulants to the list of prohibited substances in the Program since the publication of the May 2008 Program.
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The France-based IFHA's international agreement on prohibited substances, of which the Emirates Racing Authority is a signatory, states that horses can be given medication such as steroids during training only if the animal has a "justifiable" medical condition.
It is in this context that, during this fourth session, states parties to the Convention will be invited to revise again, the "Prohibited List - International Standard" (Annex I of the Convention), thereby ensuring that governments and the sporting movement apply the same list of prohibited substances and methods in 2014.
All will gather at its Headquarters in Paris, on 19 and 20 September 2013, to take part in the 4th session of the Conference of Parties to the Convention, which will amend in particular, as every year, Annex I of the Convention related to the list of prohibited substances and methods.
The "Prohibited List - International Standard" (Annex I of the Convention), thereby ensuring that governments and the sporting movement apply the same list of prohibited substances and methods in 2014, will be publicly released by the WADA on 1st October 2013 and follow the process of consultation of States Parties under the provisions of the Convention.
UNESCO: All Events | United Nations Educational, Scientific and Cultural Organization
But today, the World Anti-Doping Agency, known as WADA, is voting on whether to take the mountain away and place altitude tents on next year's prohibited list of substances and methods.
Those rules prohibited the use of certain performance enhancing substances and methods.
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Howman says the list of banned substances runs to 10-15 pages, with hundreds of drugs currently prohibited.
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World Anti-Doping Agency (WADA) director general David Howman told CNN the list of banned substances runs to 10-15 pages, with hundreds of drugs currently prohibited.
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