Originally Posted by sinoflyer

In my experience, "partially" is the operative word. On the PEK/PVG-U.S. flights that I took this year, the secondary screeners seemed to have checked only one carryon per pax. I've brought back yogurt, procured from the CA lounge, because it was placed in the other bag that the screener did not choose to look into. It's definitely a YMMV situation.