Sadly for us, but it seems that tickling is widely used by police in China as one of the methods of torture.
http://www.china21.org/English/News/2003/032403.htm
It's not the first signal, I believe someone posted some stories about it before.
http://www.china21.org/English/News/2003/032403.htm
It's not the first signal, I believe someone posted some stories about it before.


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