I know where you've been last summer

and the previous winter... and the summer before...

Well, I know if you're a girl or a man with long hair. Otherwise I don't.

Ever seen Point Break? the police find out that the bankrobbers must be surfers from the heavy metal content of their hair, pointing to a polluted beach.

Now canadian police is taking the thing further. "When you eat and drink, the isotopes from the water are incorporated into the core of your hair strand, and that isn't changed by bleaching or dying your hair. It remains consistent. It's like a record of your movement," she said. "By taking the hair from the root, we can travel back in time through that person's travel history."
Isn't this incredibly cool?

I guess it's not going to work with men who shave their heads. unless a pretty undercover agent slips into their bed and manages to retrieve some pubic hair.

And there's another problem I can foresee. namely that most people in the western world eat food and drink water produced some thousand of km away. I mean, checking my drawers, the garlic comes from china, the onion from New Zealand, the oranges from Spain and Sicily, the sausages from Sardinia. How will they cope with it?

thanks to the forensic science blog for the heads-up. Way better than any CSI fudge technique.