Police work to identify source of 'contaminated' drug
Police say they are working to find the "source and nature" of drugs linked to a death and several overdoses.
A man died on Friday and seven other people were taken to Stockton's North Tees hospital after taking zopiclone, a medication used to treat insomnia.
Cleveland Police said further testing was required as officers continue inquiries into a "potentially contaminated" batch of the drug.
A type of sleeping pill, Zopiclone is only legally available on prescription in the UK.
On Saturday, a force spokesperson said officers were working to establish the full circumstances of what happened.
They said police would continue to engage with the local community following the spate of hospital admissions.
According to the NHS, zopiclone is used for short-term treatment of severe insomnia and works by helping users fall asleep more quickly.
Those with mental health, alcohol or drug abuse issues, along with people with kidney, liver or breathing problems are among those who may not be able to safely take the drug.
Side effects include hallucinations, falls, amnesia, depression and delusions.
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