It is easy to check whether a computer or a mobile device has been hacked, a source with inside knowledge of police forensic computing skills said yesterday.

The source — who asked not to be named — said: “If someone has used their own personal computer, obviously it is very easy for a forensic specialist to go in and see what applications were used, when it was used and what sites were used.

“If the claim is ‘it wasn’t me’, people can have their computer or mobile device checked.

“If it was definitely not you, you would put up your mobile device or computer — you would put them up for examination.

“That would eliminate, or confirm, whether someone used their own computer or mobile device.”

Our source, who has a wealth of  experience in investigative matters, added: “If [a device] has been hacked, finding the hacker is obviously a bit of a harder challenge.”