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Roundup is one of the widely used weed killers in the U.S., in use since the 1970s.

The American Cancer Society lists glysophate as a \"probable carcinogen,\" based on a 2015 finding that it is \"probably carcinogenic to humans\" by the International Agency for Research on Cancer, a part of the World Health Organization. The IARC's classification has been controversial and subject to criticism and debate.

In March, after the second jury found that Roundup caused cancer, Bayer said that more than 800 studies submitted to EPA, European and other regulators \"confirms that these products are safe when used as directed,\" including a 2018 independent National Cancer Institute-supported long-term study that \"found no association between glyphosate-based herbicides and cancer.\"

ABC News' Soo Youn contributed to the reporting of this story.

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