<P> Inconsistent results have been shown when testing Face ID on identical twins, with some tests showing the system managing to separate the two, while other tests have failed . The system has additionally been fooled by close relatives . Apple states that the probability of a false match is different for twins and siblings, as well as children under 13 years of age, as "their distinct facial features may not have fully developed". </P> <P> Face ID has raised concerns regarding the possibility of law enforcement accessing an individual's phone by pointing the device at the user's face . United States Senator Al Franken asked Apple to provide more information on the security and privacy of Face ID a day after the announcement, with Apple responding by highlighting the recent publication of a security white paper and knowledge base detailing answers . </P> <P> The Verge noted that courts in the United States have granted different Fifth Amendment rights in the United States Constitution to biometric unlocking systems as opposed to keycodes . Keycodes are considered "testimonial" evidence based on the contents of users' thoughts, whereas fingerprints are considered physical evidence, with some suspects having been ordered to unlock their phones via fingerprint . </P> <P> Many people have attempted to break through Face ID with sophisticated masks, though most have failed . In November 2017, Vietnamese security firm Bkav announced in a blog post that it had successfully created a $150 mask that tricked Face ID, though WIRED noted that Bkav's technique was more of a "proof - of - concept" rather than active exploitation risk, with the technique requiring a detailed measurement or digital scan of the iPhone owner's face, putting the real risk of danger only to targets of espionage and world leaders . </P>

When was facial recognition first used in phones