It will certainly be a witness against you in court / turns states evidence :0)
How car technology helped catch a killer
Some modern, expensive cars are installed with electronic systems which can track and store information about its movements. This so-called telematics system can be used as a tracking device if the car is stolen. It can also tell when a car's engine is started or stopped and even when a window, door or boot is opened and closed.
Like a mobile phone on wheels, the system uses a SIM card.
Nick Harvey, risk data manager for Plant-I telematics company, said data is live constantly and GPS tracking could be accurate within 5m.
He said over the past 10 years, such tracking had become more commonplace in car technology and security systems and could now help with investigations.
On 3 June, two weeks after Whall was first interviewed by police, the car was found burned in Llanllechid, near Bangor. Two other men have already admitted arson and await sentence in relation to this.
Whall may have believed he had covered his tracks by having the Land Rover destroyed, possibly believing any telematics data would also go up in smoke, but his every move had been recorded and stored, back at Jaguar Land Rover.
When police obtained the data, it provided another, key piece of the puzzle.
It revealed Whall had parked at Porth Dafarch beach - a short walk from Mr Corrigan's home - at 23:10 on 18 April.
The boot was opened at 23:11:04 and closed 39 seconds later. This was Whall, said prosecutors, removing the crossbow.
Mr Corrigan was shot at either 00:29 or 00:30 on 19 April.
Again, modern technology - this time from Sky's records - proved a satellite signal was present at his home at 00:08. Its records show that at 00:28, the viewer (Mr Corrigan) stopped a pre-recorded programme and the satellite signal was "no longer present".
Roughly 12 minutes later, the Land Rover's boot was opened back at the beach. It closed 14 seconds later, at 00:42:49.
Anglesey crossbow murder: How car technology helped catch a killer - BBC NewsClick to expand...