Criminal Background Check for American living in Chile

I am an American currently living and working Chile for 2 years. I have a new job in China starting in February. I have been told I need to apply for a "Commitment of Non-Criminal Offense Record" at a Chinese Embassy. Can I get a background check from Chile (Since I've been working and living here and not in the USA), and apply for the authentication by a Chinese consulate/embassy in Chile, to be used in a month to apply for the z visa in the USA? If so, what forms do I need? I will be leaving Chile in December to travel and then I will be in the USA in January to officially apply for my visa. Thanks.