Z visa/ Expert certificate questions

I have recently been contacted by an International school in Chongqing to teach, and they have asked me to provide a criminal record report. I have been teaching in China for 11 years and it's been 3 years since the last time I left the country at all. Usually the schools I had in Tianjin got the criminal report from the local Chinese police as I have a residence permit for China and I have no exits listed. But now they are asking for one from the US- I no longer hold an address nor a drivers' license in the US- and haven't either in 11 years. I am married to a Chinese national and my daughter was born here. How am I supposed to get a police record from the US or can I just use the Chinese report? This is the first time (other than when I first came) that they have asked for a US police report.