Investigators say the 10-year-old boy David Scratchley targeted was the child of a woman at the Matt Talbot Center where Scratchley worked.
Scratchley, 53, was once considered an expert on addiction. He served as an instructor at Seattle University and director at Seattle Children's Home, a leading psychiatric facility, where he oversaw several programs. He also lectured on the national circuit.
His lawyer, John Henry Browne, says drugs, cocaine in particular, were his downfall.
With credit for time served, Scratchley could be released from prison in about three years.
He'll have to register as a sex offender.