Massachusetts voters may never know the true genetic heritage of Sen. Elizabeth Warren,D-Mass., but they can be very clear on what the law says about performing DNA testing without written consent.

That’s bad news for aspiring conservative super-sleuths, and Howie Carr in particular, who doubt that Warren really is of Native American ancestry. Six years ago, that Boston radio host tried learning Warren’s genetic makeup from a DNA sample he took from the cap of a pen Warren chewed during a book signing.