Yup, I was thinking the same thing reading that article. I used to find owl and hawk feathers on bike rides and trail runs and use them for fletching. Someone pointed out the law to me. Just fyi possession of a hawk or owl feather is a $10,000 fine. A ranger would have to be quite a prick to give out a $10,000 fine instead of a warning to someone who was unaware and had a feather on their hat or rear view mirror, but this law is in place for a reason. The wetlands and Migratory Birds Treaty Act were put in place to halt the rapid extinction that was happening in this country. That and stopping the use of DDT and other poison are the reason we can still see whooping cranes and eagles in the wild today instead of just in books.
If someone finds a feather and uses it for fletching I don't have a problem with that, but don't post it online for the world to see or your asking for trouble.