How can you tell it's 'the wrong hair'?

Under most circumstances, I couldn't care less about Paris Hilton and her hair, but this article caught my eye.

Paris Hilton sued for wearing the wrong hair

If you don't want to waste your time reading about Hilton, she's being sued for allegedly failing to wear a particular brand of hair extensions after being paid US$3.5 million to do so.

And I am left wondering: How can the company that believes they were wronged tell Hilton was not wearing THEIR hair extensions? Do you women folk swap hair extension tips while you luxuriate in public rest rooms? Was Hilton's failure to honor her contract discovered because there is a way to tell virgin hair from non-virgin hair? (Apparently, the product Hilton agreed to lend her name and face to is made from the hair of European virgins--or so the online listing for Hairtech International products imply, as the first paragraph on this random page shows. Maybe she was busted because virgin hair would look decidedly unnatural on someone as well-used as Paris Hilton?)

Please help educate a curious bachelor whose female friends would just turn away and laugh. How can you tell if Paris Hilton is wearing the hair of a virgin in this photo from a 2008 media event held specifically to promote the Band-It hair extension product from HairTech International?



(While contemplating the mysteries of telling one brand of hair extensions from another, perhaps you would be interested in reading reviews of movies featuring Paris Hilton at Terror Titans.)