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Through her research, she found photographs of how the particles were distributed from 1953-1954 and 1963-1965.

In Corpus Christi, the chemical was dropped from airplanes over large swathes of city. In St Louis, the Army put chemical sprayers on buildings, like schools and public housing projects, and mounted them in station wagons for mobile use.

Despite the extent of the experiment, local politicians were not notified about the content of the testing. The people of St Louis were told that the Army was testing smoke screens to protect cities from a Russian attack.

'It was pretty shocking. The level of duplicity and secrecy. Clearly they went to great lengths to deceive people,' Professor Martino-Taylor said.

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