She said her son had been ill with asthma in the lead up to the raid, and she had previously presented proof to officials.

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It will also serve as proof of the wisdom of understanding the marketplace well enough to lead, rather than follow.

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Waiting for high levels of scientific and clinical proof before taking action to prevent well-known risks can lead to very high health and economic costs, as was the case with asbestos, leaded petrol and tobacco.

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Scraps of lead scattered over the rubbery floor have to be cleared up with explosion-proof vacuum cleaners.

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Unlawful killing was a verdict that required a high standard of proof, Mr Knowles added, and inquest verdicts would not automatically lead to prosecutions.

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Dr Lorenz Studer, head of the Stem Cell and Tumor Biology Laboratory at the centre, and the lead researcher on the study, told BBC News Online that the study was "proof of principle" that cloned embryonic stem cells could be reliably transformed into a variety of useful cell types.

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There is no conclusive proof that Celebrex works as a preventive drug for anything other than a rare genetic condition that can lead to colorectal cancer.

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Cambridge is living proof that this can be done: other cities, including New Haven and Hartford, should follow its lead.

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