About the problem of taking the green channel at the airport

If you have items that need to be declared, please go through the red (declaration) channel and go through customs procedures; if not, please go through the green (no declaration) channel.

But even if you take the green channel, if the customs officers feel suspicious, they will still inspect it.

For details, please see the "Airport Guidelines" (although it is for Guangzhou Baiyun Airport, it applies to the whole world):

/jczn/gjdd.jsp