When you go through the body-scanning machine in the airport, your hair may show up as a block in the photo. If this happens they will take you aside. Tell them discretely that you are wearing a hairpiece. They will touch your shoulder, then your head, and then your shoulder to make sure nothing is underneath. It is easy and fast and you will not feel uncomfortable. The clips may set off the alert in body scanning machines in prisons or high-security areas.