A photographer from Carlton, Oregon, has been sentenced to 40 years in federal prison for drugging and sexually assaulting multiple teenage models, some as young as 15. Robert Arnold Koester, aged 59, was convicted of producing child sexual abuse material after pleading guilty to eight counts earlier this year. The sentence was handed down by a federal court on 4 August.
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According to the U.S. Attorney for the District of Oregon, Koester misused his position as a photographer to gain the trust of vulnerable teenage girls interested in modelling. He lured these young women to locations in Oregon and California under the false pretext of a promising modelling career affiliated with his agency, before engaging in horrific criminal behaviour.

Koester’s methods included offering the victims alcohol and drugs, such as cannabis and cocaine, to entice them into participating in nude photo shoots. The authorities revealed that he showed them cases of naked models to coerce them into compliance. In some instances, he used hidden cameras to capture explicit images without the young women’s consent.
Law enforcement discovered that Koester had abused some of the girls by drugging them with substances like GHB, which rendered them unconscious. While they were incapacitated, he subjected them to sexual and physical assaults, using methods including strangulation and slapping. He recorded many of these assaults for his own gratification.
In addition to the abuse of unconscious victims, Koester coerced some girls into sexual acts while they were awake, further complicating the trauma inflicted on his young victims. The FBI stated that many of the images that Koester produced of his victims were graphic, and he is reported to have shown them images of their own abuse, laughing inappropriately as he did so.
Koester’s criminal activities first came to light when he was arrested in November 2018 in California. Following his arrest, he was charged with multiple counts of producing child sexual abuse material in mid-2019. In August 2020, two additional charges were added. Previously, Koester had been sentenced to 25 years in prison for related cases in San Diego and 50 years in Oregon’s Yamhill County. His sentences from these jurisdictions will run concurrently with his recent federal sentence.
Scott E. Bradford, U.S. Attorney for the District of Oregon, described Koester’s crimes as some of the most heinous the district has encountered. He asserted that the abuse inflicted on these young girls would leave lasting scars, not only emotionally but also in the form of the images that will haunt them throughout their lives.
In light of the gravity of these crimes and the courage exhibited by the victims in coming forward, Doug Olson, Special Agent in Charge of the FBI in Portland, highlighted the importance of accountability for such abuses. He emphasised that Koester exploited the trust of young individuals who were merely seeking opportunities to fulfil their dreams.
Support and resources are available for anyone affected by such crimes. Individuals who suspect child abuse are encouraged to contact the Childhelp National Child Abuse Hotline, which operates 24/7 and provides assistance in multiple languages. Victims of sexual abuse can also reach out to the National Sexual Assault Hotline for support.
As the case unfolds, community leaders and support organisations like the FBI continue to advocate for justice and healing for victims of abuse, recognising the challenge they face in recovering from the trauma inflicted upon them.
