China has been keeping tabs on the restive Tibet province through a 'grid' system and some 600 'convenience police posts' armed with high-tech equipment that monitor the daily life of the citizens of Lhasa and other Tibetan towns. Worse, 'volunteer security groups' known as 'Red Armband Patrols' are roaming around in order to get more information and 'classify' each and every citizen, says Claude Arpi