After passing the security check at the airport, my knife card and my cousin's eyebrow trimmer (more expensive) were stopped. The staff said that the knife was confiscated and the knife card was bigger than the credit card. This is a gray area. What does gray mean? It can be said to be black or white. As for what color it is, it is up to powerful people to decide. Confiscate your knife card, probably just because the staff likes it.

If you don't agree with this, you can only say that your social experience is too shallow and stubborn.