Hello. My wife travelled to China twice: once with an L tourist visa for over a month and a second time she stayed for one year under a student visa. We got a Chinese police certificate for her long stay to study but we are worried we need to include another one for her one month travel especially that it happed a few months before her travel to study. I am aware that police certificates are required for travels that last more than 6 months but I got confused with this one. Thanks for your reply!