valid question

Hair doesn't contain DNA, unless the follicle comes with it

Legit concern I hadn't even considered.

I've read several reports that they sell most of the donated hair and even charge cancer patients for the wigs: https://www.forbes.com/sites/quora/2013/05/13/locks-of-love-6-million-of-hair-donations-unaccounted-for-each-year/#6c40b4b75fd0