Hair does not have DNA

While it's true that there is no nuclear DNA in the shaft of the hair there are often some type of remnant cells that do contain it. Perhaps it can't be done in all cases but forensic scientists have extracted DNA from cut hairs. It's conceivable that the vastly superior technology of the movie can do this with much more successfully.

I does have DNA, don't you ever watch those crime forensic shows where the perp leaves behind a hair strand and is implicated in the crime?

Hair doesn't have DNA except at the root. OK, also the sky is not blue except for the blue parts of the sky.

The base/follicle of a piece of hair contains DNA, but you'd need to pluck it off its root. You wouldn't, for instance, be able to get DNA from the hair found in a barber shop/hairdressers, but hair that has naturally shed is often used by forensic scientists in obtaining crime scene DNA.

An entire strand of hair does contain DNA, but if Athena simply used the middle of Casey's hair rather than plucking a hair from its root, you're right to point out the film's flaw.

The people who invented a way to move between dimensions also invented a way to extract DNA from a strand of hair.

Actually, although the hair follicle contains the complete DNA sequence, the hair itself does contain mitochondrial DNA, which can be used for identification.

I thought I'd heard every form of protein-myth out there. Goes to show, ignorance is infinite. Every living cell is made of protein (and a bunch of other things; including DNA). Protein is simply PROPPED up in importance; as in propaganda to make meat-eating seem important).

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Steps to a great life:

Watch "Twilight Zone"
"Escape the Diet Matrix"
Go vegan

Hair most certainly does have a persons DNA within it. You are incorrect.