Not only is mobility data unique, it may also reveal sensitive information including someone's age, gender and ethnicity, which could be used to discriminate in housing, lending, health care and other areas.
It does not reveal information about someone's appearance or medical or behavioral conditions — a level of privacy that removes bias and produces objective information to assist criminal investigations, they said.
For example, regular visits to an HIV clinic can offer information about someone's health.
Information about someone's personal or family health history could be used for blackmail or phishing, or help an adversary masquerade as someone else.
One of the many arenas in which this issue plays out is in access to information about someone's previous criminal convictions.
Given absolutely no information about someone's maths skills, you might think men and women would be equally likely to be hired.
Privacy advocates fear that although the data is anonymised, the Apple data is not encrypted and could be misused by law enforcement or others who wanted to capture information about someone's movements.
Since Swipebuster uses public data, the website is lawful, but in most states it is illegal to track information from someone's device without their consent, according to David Klein, a lawyer who specializes in technology and marketing law.
Not only does its information include someone's whereabouts, down to which building they were in when they started using the service, it even knows if they travelled between locations on foot, bike or bus.
Home Secretary Theresa May told the Sun that 88 women were killed by a violent partner or ex-partner last year, and said there is currently "considerable confusion" about when or if police can share information on someone's violent past with the public.
