WADA says it "read with interest media reports suggesting a television `confession' made by Lance Armstrong" to talk show host Oprah Winfrey on Monday.
Armstrong reportedly hopes to return to competition in recognized triathlon events.
However, WADA says "only when Mr. Armstrong makes a full confession under oath -- and tells the anti-doping authorities all he knows about doping activities -- can any legal and proper process for him to seek any reopening or reconsideration of his lifetime ban commence."
The agency says athletes must pass on details of performance-enhancing drug use "to the relevant anti-doping authorities."
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