What is going to happen to Mark Stone's mobile phone?

I was very surprised to read in the Evening Post today that the Blackberry mobile phone belonging to undercover cop Mark Stone is to be 'disposed of' by the Crown.

As a vital piece of evidence that might shed light on the issue of whether or not PC Stone had 'gone native' as the police have suggested or whether he was monitored and controlled by his superiors at all times, surely this device should be in the safekeeping of the IPCC?

http://alanadale.wordpress.com