The curious 'Safety Information' menu

Dig into the Droid's menus, and you'll find some interesting stuff.

One that I've seen mentioned NOWHERE is this: Open the Settings app, scroll to the bottom, select About Phone, and pick the fifth item on the list -- Safety Information.

In it you'll see that the phone notes it has a SAR rating of 0.64 watts per kilogram held at the ear and 0.72 on the body.

But the official FCC numbers are 1.49 and 1.50.

I'm curious as to what's the story behind the discrepancy.