Wardens in the Jinzhou Forced Labour Institute have used a lot of torture methods to force Falun Dafa practitioners to renounce their belief. They also tie a hard hat onto a practitioner's head for long periods of time in an attempt to induce a mental collapse.
(Here are a few simple illustrative drawings.)
Chinese version available at http://minghui.ca/mh/articles/2005/1/19/93833.html
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