Conversation so far:
what is ai weiwei  release referring to?
On 22 June 2011, the Chinese authorities released Ai from jail after almost three months' detention on charges of tax evasion.
what evidence did they have?
had allegedly evaded taxes and intentionally destroyed accounting documents.
how was he treated in prison?
his sister gave some details about his detention condition to the press, explaining that he was subjected to a kind of psychological torture.
what did they do to him?
he was detained in a tiny room with constant light, and two guards were set very close to him at all times, and watched him constantly.
was he subjected to any other mistreatment?
Ai also mentioned that his detention by the Chinese regime was hellish (Chinese: Jiu Si Yi Sheng ), and stressed that he is forbidden to say too much to reporters.
what was he charged with?
Ai's supporters widely viewed his detention as retaliation for his vocal criticism of the government.
what did the public think of his imprisonment?
Ai's supporters widely viewed his detention as retaliation.
did they have evidence against him?
professor Wang Yujin of China University of Political Science and Law stated that the release of Ai on bail shows that the Chinese government could not find any solid evidence.
did he give any interviews?
In January 2012, in its International Review issue Art in America magazine featured an interview with Ai Weiwei at his home.
what did he speak about?
CANNOTANSWER.

Question: what is an interesting fact regarding  his release?
Self-contained rewrite: what is an interesting fact regarding Ai Weiwei release from chinese prison?