A US jury has found that one of the most widely used worldwide weedkillers was a ‘substantial factor’ in causing a man’s cancer.

Glyphosate is the active ingredient in many weedkillers used in conventional farming, in public spaces and gardens

Pharmaceutical group Bayer had rejected claims that its glyphosate-based Roundup product was carcinogenic.

But the jury in San Francisco ruled unanimously that it contributed to causing non-Hodgkin’s lymphoma in California resident Edwin Hardeman.

The next stage of the trial will consider Bayer’s liability and damages.

During this phase, Mr Hardeman’s lawyers are expected to present evidence allegedly showing Bayer’s efforts to influence scientists, regulators and the public about the safety of its products.

Aimee Wagstaff, one of Hardeman’s lawyers, said Monsanto influenced the science around Roundup through its close links to regulators, including a very friendly relationship with the U.S. Environmental Protection Agency, which has not required a cancer risk warning for the weed killer.

Wagstaff also suggested Monsanto ghost-wrote scientific studies to influence regulatory reviews.Which were often published as third party independant studies.

Bayer denies allegations that Roundup or glyphosate cause cancer, saying decades of independent scientific studies have shown the chemical, one of the most widely used weed killers, to be safe for human use.

For more on the ongoing court case: click here