The fingerprint scanner on Apple's new iPhone 5S is being heralded as the most innovative feature on the latest model of the company's smartphone. However, Apple has admitted that its "Touch ID" sensor isn't exactly perfect -- namely, it doesn't like sweaty fingers.
Company testers have discovered that the Touch ID sensor will not always respond to fingertips coated in sweat, lotion, or other liquids, an Apple spokesperson told The Wall Street Journal.
Besides fluids, the scanner also doesn't seem to like fingertips with scars. However, the company spokesperson told the Journal that this issue is easily solvable by using another finger on the scanner.
In adding a fingerprint sensor to the iPhone, Apple has begun to rethink device security and online identity. The scanner will presumably act as a first line of defense against would-be thieves and hackers.
Users' fingerprint data will be encrypted and stored on the device's processor -- it will not be backed up to iCloud. According to the Journal, this type of storage means that it should be near impossible for a thief to reverse-engineer someone's fingerprint.
CNET contacted Apple for comment. We'll update this story when we get more information.