Officers must secure corroborating evidence in the UK before a prosecution becomes possible.
The deviations are too small to be seen in any single quasar, but by averaging the results for 72 quasars the team claims to have secure statistical evidence.
Ms Porter said the gap between the number of homophobic hate crime incidents reported to the police and the number of convictions exists because many cases fail to secure enough evidence for prosecution.
Our soldiers and agents in the field will have to run more risks as they must secure physical evidence at the point of capture and maintain a chain of custody that will stand up to the standards of a civilian court.
Then you secure it as evidence.
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But often police and prosecutors reckon they cannot get enough evidence to secure a conviction and throw in their cards.
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The Lawrences' first major disappointment came when the Crown Prosecution Service dropped proceedings against two men in July 1993, saying there was insufficient evidence to secure a conviction.
Mr Ngcuka is used to coming under attack, but he unleashed a veritable war within the African National Congress when he pronounced that there was enough prima facie evidence to pursue a case against Deputy President Jacob Zuma in connection with allegations of bribery linked to the government's arms procurement deal, but not enough evidence to secure a conviction in court.
The Liberal Democrats' spokesman also pointed to Ofsted's recognition that in future inspectors would be required to report on schools only "when they have sufficient evidence to come to a secure judgement".
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Recently, a group of three national immigration advocacy groups claimed to have found evidence that, in California, Secure Communities isn't just reserved for violent criminals.
Fabrizio Viola, chief executive of Monte dei Paschi who was brought into the bank to turn it round a year ago, said on Monday he thought the acquisition of Antonveneta was "expensive" but he had seen no evidence of bribes being paid to secure the deal, a suggestion put forward by prosecutors.
Mr Scott claimed that by speaking to Gilroy as a witness, they were able to extract evidence from him, which the Crown used to secure a conviction against him.
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