Stingrays, or IMSI catchers, can be used to search for individual cellphones, and even track people's movements, often without a warrant, and while picking up numerous other cellphones from innocent bystanders.
But there are some anxieties around the ability of the police to turn up at a crime scene and immediately start accessing deceased individuals' cellphones without any need for permission.
Indeed, a list of incoming and outgoing calls on an individual's cellphone can provide a robust trail of evidence.
Some projects, for example, may alert individuals via cellphone, bringing real-time earthquake warnings to the general public.
The United States Supreme court issued a decision this morning required police to obtain a warrant from a judge in order to track individuals through cellphone records.
The guides said many individuals with cellphones acted as if any extreme problem can be solved by calling in someone to rescue them instead of relying on planning and preparation.
Each individual receives a cellphone call while dining in a very noisy restaurant.
In some settings, one mobile phone might be used by more than one individual and therefore cellphone interventions will need to consider issues of confidentiality and privacy [ 13, 21].
