Doubt much can happen, I don't know how the encryption works but I really doubt that there is a key that can be used to decrypt all communications.The maker of the BlackBerry, Research in Motion, said on Monday night that it would co-operate with a police investigation into claims that its popular BlackBerry Messenger service played a key role in organising the London riots.
http://www.guardian.co.uk/uk/2011/aug/08/london-riots-blackberry-messenger-looting
Impotent police with their hands tied behind their backs by the snivelling liberal politicians.
Police Officer down, he took a missile full to the body.
BBM should be firewalled off for a few days IMO