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In page Human rights in China:

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One of the most famous cases of politically motivated psychiatric diagnoses took place in 1992, when Wang Wanxing was arrested for displaying a pro-democracy banner in Tiananmen Square.[4] After Wang's arrest, his wife signed a statement confirming his mental instability, because police told her that doing so would ensure Wang's immediate release.[4] However, Wang was instead placed in the Beijing Ankang hospital.[4] He was exiled to Germany in 2005.[5]