There was a long, long wait at the customs office at the port when I got to Shanghai.  Evidently, not too many people arrive in the People's Republic via container ship.

So as the mess got sorted out -- which (surprise!) took $100 in cash -- I had time to wander around the customs office.  There was an information kiosk with a touchscreen display, and as I tapped my way through the various listings, I came across this screen.

It may be hard to read.  It's the "Code of Professional Ethics" which all customs officers are supposed to follow.

Of course, I agree with all of them.   But you should feel free to choose your own favorite.