A federal judge on Monday halted California’s plan to require Monsanto to place warning labels on its Roundup products, saying scientists haven’t shown a clear connection between glyphosate and cancer. U.S. District Judge William Shubb sided with the St. Louis-based chemical giant in its First Amendment lawsuit, ruling that warning labels, which would have been required as of July, could confuse and mislead customers.“The required warning for glyphosate does not appear to be factually accurate and uncontroversial because it conveys the message that glyphosate’s carcinogenicity is an undisputed fact, when almost all other regulators have concluded that there is insufficient evidence that it causes cancer,” the ruling issued late Monday states.