We have been engaged in a war against drugs for 30 years. We're plainly losing it. We have not achieved very much progress. The same problems come round and round."
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Dr Michio Hirano denied having any financial interest in the experimental treatment considered for the baby.
The measures are set to be included in a court-mandated clean air strategy the Government is due to publish on Wednesday.
Low pressure in the Atlantic brings a spell of wet and windy weather on Wednesday.