Buckinghamshire CC ANPR cameras

[Chris Edwards]

On Wed, 11 Jan 2012, Brian Morrison wrote:

| On Wed, 11 Jan 2012 08:27:02 +0000
| Mark Lomas <ukcrypto at absent-minded.com> wrote:
| 
| > Instead the police took the lists of all other phones in the same cells at
| > the times of the calls (the data James mentioned) and looked for phones
| > that were nearby on more than one occasion.
| 
| So the disciplined kidnapper needs to ensure that any personal phones
| are switched off

Right.

| and that they have a number of other PAYG phones to use for other calls 
| which they dispose of carefully after use

I'm not sure how kidnapper using a fresh PAYG phone for each call makes 
any difference (to this exact scenario).  Simply given knowledge of what 
cell each call was made from, the police can look for *other* phones nearby
on multiple occasions.