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Hair is like any other body part/ personal object. If some one gets a hold of it and knows what their doing you could be in trouble. But, that being said, the chances of that happening are relativly low. Anyway back on point. Hair does seem to be one of those people parts that tend to work well when it comes to binding perhaps because of its shape. I have read some where of people giving their love ones bracelets made of their own hair, but that would require a lot of trust because of the a fore mentioned reasons.
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I have a spell that uses an eyelash to ward an area against spies. It's designed to keep the uninitiated from noticing a magician's magical gear, allowing an "in the broomcloset" witch to practice secretly.