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Page last updated at 08:44 GMT, Monday, 23 August 2010 09:44 UK

1951 French hysteria 'possibly caused by LSD'

In 1951, a mysterious outbreak of what was described as "mass hysteria" erupted in the small town of Pont Saint Espirit in south east France.

BBC reporter Mike Thomson investigates claims that the reason hundreds of people suddenly fell ill was the result of an experiment using LSD carried out secretly by the CIA.

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