Originally Posted by
jiejie
Yes, pretty much so at least from what I've seen out of Asia--mandated by US authorities.
Yep, I've also had the secondary flying to the US from SYD, HKG, and AMM.
The secondary screening also applies for flying to Australia, at least from HKG. Unfortunately my memory is failing so I can't recall whether my last flight to Australia from PVG had a secondary or not.
Typically secondary screening will confiscate any overlimit liquids that you may be carrying, i.e., duty free that you just purchased.