A number of measures have been defined to diminish the risks relating to this type of problem. In the event that a device is not returned, it is recommended to perform the following operations:
If the owner is able to retrieve their device, they should treat it as untrustworthy and even compromised, as they cannot know who has had access to it. If you suspect any kind of malicious installation, it is important to reinstall the software or even migrate all the data to new device. The First Aid kit describes a number of measures that should be taken in the event that the device is returned after a certain amount of time has passed by: http://www.circl.lu/pub/dfak/DevicesSeized/ Prevention, to lessen risks
Prevention remains key in order to lessen the risks when a device is lost, stolen or seized. Simple actions are recommended in order to protect data, such as encryption, passwords, locking with a PIN code for telephone, tools that enable data to be deleted remotely, the installation of theft alarm software.