PORTLAND A former Washington State Patrol trooper who was arrested Wednesday sexually abused his adopted daughter for more than 8 years, according to court documents released Thursday.

Kenneth S. Garrison, 51, started abusing his adopted daughter around 2005 and continued until last year, a declaration of probable cause says.

Garrison s now 24-year-old daughter, whom he and his wife adopted in Clark County in 2000, was diagnosed with numerous issues including borderline intellectual function, medical records show.

On Jan. 24, detectives spoke with the victim who now lives with her grandmother in Arizona. She detailed the years of sexual abuse she suffered, which started when she was 15 years old while she lived with Garrison and his wife at their homes in Kalama and Vancouver, Wash., documents show.

Garrison allegedly abuse her around three times a week often before school and sometimes while he wore his WSP uniform.

The last time Garrison abused the victim was the day she flew to Arizona to live with her grandmother, documents show.

She then told her grandmother, Garrison s mother, about the abuse. Garrison s mother then confronted him about the abuse, which he did not deny. Instead he implored his mother not to tell his wife, the probable cause declaration says.

Garrison resigned from his lieutenant s position with WSP in December and retired from the Washington Army National Guard Monday.

Garrison was arrested by a Portland-area SWAT team Wednesday at a motel in east Portland. He appeared Thursday in a Multnomah County Court.

A detective said the investigation is continuing. Anyone with information was asked to call the Clark County Sheriff tip line at (360) 397-6008, extension 2120.

Background: Vanc. WSP officer accused of sex abuse

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