So I was in the apple store tonight to buy one of the new iPhone 5s Apple cases. And I figured it would be a nice opportunity to try out the new fingerprint scanner for purchases. So I scan my purchase and proceed to checkout. The request for my iTunes Password pops up, but no option for scanning my finger. I tried this multiple times and it did not even give me this option. I even asked an Apple employee and he had no idea why it wasn't working. I have also found that it works sporadically w/ iTunes or App store purchases. And I have all of the settings configured properly. Others experiences? Or is this just a problem with my device?