In Beijing, they scan bags right before you get out to meet your loved ones. They appear to select people at random, and from my observation you have 5%-10% chance of being selected.
I'm not sure what they're looking for, though, as I've never seen them open a bag after it went through the scanner.
I was quizzed about my road bike (which was obvious as it was packed separately) but after I explained it was old, and 'just a normal bicycle' and not 'for competitions', they let me through without a fuss.
They are scanning all bags in Beijing these days, at least when coming out of T2 customs. I'm more worried about transporting it as,baggage in the first place. I'm just not a good yellow cow.
I'm not sure what they're looking for, though, as I've never seen them open a bag after it went through the scanner.
I was quizzed about my road bike (which was obvious as it was packed separately) but after I explained it was old, and 'just a normal bicycle' and not 'for competitions', they let me through without a fuss.