They are convinced the masterminds are still at large because high-level authorisation would have been needed for the killing of such a globally renowned activist.
Despite the fact that the devices are also capable of listening to phone calls, in many cases they still do not require a warrant to use, instead requiring a much lower-level authorisation known as a "trap-and-trace", a court order designed in the era of the rotary phone.
"There has not been much movement on the bureaucratic obstacles, there is still a need for authorisations at several levels for each convoy, something we continue to work on with the Syrian government," OCHA spokesman Jens Laerke told a news briefing in Geneva.
He added: "Law enforcement agencies are required to act in accordance with the law and with the appropriate levels of authorisation for their activity".
Bill Teuber, EMC's chief financial officer, says the slowdown in the US economy has caused some customers to become "hesitant to attack the markets they serve" and that others have added additional levels of authorisation to purchase orders.
After the American attack on Afghanistan, al-Qaeda's foot-soldiers have reportedly been given the green light to attack "targets of opportunity" without authorisation at the highest levels.
Sleep deprivation and stress positions could be used but only under special authorisation from a high-level authority.
Restricting the use of section 60 searches, which do not require any grounds for suspicion, to ensure they are not used for dealing with routine crime problems, and requiring a more senior level of authorisation.
Regulation of undercover police – new rules come into force requiring higher level of authorisation Average season ticket prices are due to rise by 4.1% Scout Association introduces pledge that removes the promise by Scouts to do their duty to God.
Another obstacle is the intricate administrative processes currently needed for project development and authorisation, especially at municipal level.
