Michael Arrington has a post at the TechCrunch blog about his own experience sending in his DNA to 23andMe. Before you let out a "been there, done that" yawn, GTO has this to say -- Arrington raises a great issue that we haven't seen in anyone else's posts so far. What if, he asks, he just sends in someone else's DNA under his own name? Sure, a service company like 23andMe could easily distinguish male DNA from female. But within the same sex, just how are they policing users to make sure that people are sending in their own DNA? Arrington's post has more than 50 comments that run the gamut from tinfoil-hat-wearers to people who just aren't concerned, so those are worth a skim too.