I used to work at British Telecom and they where very hot on this issue. BT Security do not fuck about when they investigate this sort of crime.<p>Developers with wide access to data had to be positively vetted to TS level.<p>A few years ago there was a contract killer that suborned BT employees to find the address of some one in the witness protection schemes parents new address and killed them. The people concerned are doing 10-20 years for conspiracy.