Ali's doping test at the exhibition returned positive for Cathine, a banned stimulant found in the illegal Yemeni drug Khat.
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His doctor later admitted medicines he had given Ali, when mixed together could have created the positive test for Cathine.
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Ali argues he had taken Cathine inadvertently after contracting a cold in China, but widespread use of hallucinogen drug Khat is known among the Yemeni American community.
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He returned to The Prudential Center on August 21, 2010, in his second televised bout and knocked out Lenin Arroyo on the undercard to Tomas Adamek versus Michael Grant.
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Three weeks after the Chicago tournament, Ali participated in a "USA vs. China and Kazakhstan" exhibition event held in Zunyi.
Muhammad Ali | Hyder Ali | Muhammad Ali Jinnah | Ali | Muhammad Ali of Egypt | Zulfikar Ali Bhutto | Ali Akbar Khan | Tariq Ali | Saif Ali Khan | Asif Ali Zardari | Ali Shariati | Ali Abdullah Saleh | Ali Mohammed Ghedi | Ali Khamenei | Ali Pasha | Ali G Indahouse | Nusrat Fateh Ali Khan | Husayn ibn Ali | Hasan ibn Ali | Ali Imam | Michael Nazir-Ali | Laila Ali | Jebel Ali | Ali Baba | Zine El Abidine Ben Ali | Wajid Ali Shah | Shakir Ali | Mohammed Hussein Ali | Ayaan Hirsi Ali | Ali Ryerson |