内容摘要：Sentencing Cooke, Judge Tracey Lloyd-Clarke said he had made "deliberate, conscious and pre-meditated attempts" to commit offences which were of "harm to South Wales Police and police in general".

Sentencing Cooke, Judge Tracey Lloyd-Clarke said he had made "deliberate, conscious and pre-meditated attempts" to commit offences which were of "harm to South Wales Police and police in general".

"I don't want what happened that day to be what defines you."On Monday Judge Thomas said he believed the girl was not sorry for what she did, and that she "actually enjoyed" the publicity "in a weird way".

"In my view, you wanted as many of your fellow pupils as possible to see what you intended to do," he said."I've watched you carefully over the two trials. I believe that what you did that day, you did above all, for attention. Attention, you perhaps haven't had."Judge Thomas added the defendant had already "made serious threats to someone" since last April, and posed a potential risk even after custody.

"I hope you will go on to lead a good life," he added as he passed the sentence.The girl listened, her arms crossed, and she was taken back to the detention centre.

She will be almost 30 when her licence period ends.

Speaking outside the court, Ms Hopkin said: "While some might see today's sentencing as a good result, there is no real good result when a child or young person finds themselves in a situation like this."James Malley, a research technician, operates a machine that can work out how much oxygen is contained within the specs of dust.

He shows us a test run of what he will do."I'm going to hit that grain on the tray with a laser," he says, showing the scene magnified on a computer screen.

"It's going to start to glow, and you will see it melt inwards," he says.The team has a year to finish their research. By the end, their search for answers will probably end up destroying the samples.