The unanimous ruling Friday from the U.S. Court of Appeals for the 9th Circuit is the latest development in a drawn out court battle between the EPA — which blocked a planned agricultural ban on chlorpyrifos in 2017 — and the anti-pesticide, environmental and farmworkers organizations who disagreed with that decision.

Earthjustice attorney Patti Goldman, who represents the groups fighting to ban the pesticide from foods, commended the court for its ruling in a statement Friday.

"While we are moving forward, the tragedy is that children are being exposed to chlorpyrifos, a pesticide science has long shown is unsafe," she said. "We hope Trump's EPA finally decides to protect the future of countless children and the health of millions of farmworkers."

Noting that public health advocates have been working to outlaw the pesticide for more than a decade, Natural Resources Defense Council senior attorney Mae Wu said, "All the science says EPA must ban."

Kristin Schafer, executive director of the Pesticide Action Network, tweeted, "No more delay, [EPA]."

Scandal-ridden former EPA chief Scott Pruitt blocked the ban on chlorpyrifos in March of 2017, shortly after he met with the chief executive of Dow Chemical, which has been selling the pesticide for decades and lobbied against restrictions on it.

The appeals court ruled last August that the EPA had illegally impeded the ban and ordered the agency to finalize its proposal. But then, the EPA requested a rehearing, which the court granted in February.

Shortly before the rehearing last month, Goldman explained the legal issues behind the case in a short video:

Environmental Working Group president Ken Cook, in a statement Friday, criticized EPA Administrator Andrew Wheeler — who replaced Pruitt — for failing to ban the pesticide and urged him to fulfill the agency's mission to protect human health and the environment.

"We'll find out in three months if the Trump EPA remains under the tight control of the chemical agriculture industry, or if Administrator Wheeler will finally take his job seriously and ban this brain-damaging pesticide," said Cook. "It's deplorable that Wheeler has defied the court's order for almost nine months, and it's time for him to do his job and protect public health."