A polygamous sect leader already serving a 50-year federal prison sentence for orchestrating sex involving children was convicted Friday on state child abuse charges after girls were found in an unventilated trailer he was hauling through Arizona.

Someone alerted authorities about the trailer in 2022 after seeing small fingers reaching through gaps in the doors. Police stopped Samuel Bateman’s vehicle as he was driving through Flagstaff and found three girls inside, who were ages 11 to 14 at the time. The trailer was enclosed with a makeshift toilet, a sofa and camping chairs.

Bateman was convicted of coercing girls as young as nine to submit to sex acts with him and other young adults, and for scheming to kidnap girls from protective custody, the story of which is the focus of the Netflix series Trust Me: The False Prophet.

Bateman previously claimed to have more than 20 “spiritual wives”, including 10 girls under the age of 18. He testified in his own defense, telling jurors he would never harm the people he loves. He acknowledged during cross-examination that he knew the girls were in a hot trailer for hours and the ventilation was not good.

“I just trusted myself as a driver,” he said. “I ask God to bless me every time we hop in that vehicle.”

Jurors in the state case were not supposed to hear about Bateman’s conviction in federal court. The judge barred the evidence from being introduced. But Bateman brought it up several times as he represented himself, leading the judge to strike the comments from the record.

The jury delivered the verdict Friday in about 40 minutes, convicting him on all three counts of child abuse.

Federal authorities said Bateman, a self-proclaimed prophet, traveled extensively between Arizona, Utah, Colorado and Nebraska as he built an offshoot network of the Fundamentalist Church of Jesus Christ of Latter-day Saints, which historically has been based in the neighboring communities of Colorado City, Arizona, and Hildale, Utah.

He and his followers practiced polygamy, a legacy of the early teachings of the mainstream Church of Jesus Christ of Latter-day Saints, which abandoned the practice in 1890 and now strictly prohibits it.

Bateman was one of the trusted followers of Warren Jeffs, who previously led the sect and is serving a life sentence in Texas for sexual assault of children.