Edited implies you were obviously angry, and if I have angered you, that was not my intention, but I won't apologize for what I know to be true. I taught in sichuan before, and was informed the visa run there was no longer possible and that a police check was needed. There are no Z visas conferred to people in China, esp. from Guangdong province, if you have a current Z visa and police check then it may well be different, but I haven't been back in mainland china for years and was last in HK last year before christmas. HK is seperate from the mainland anyway, so I couldn't care less about offending China. If something has changed, and it may have, can you cite a verifiable source please?

Cheers and beers,
SMGS