RCW 72.01.415: Offender under eighteen confined to a jail—Segregation from adult offenders.

An offender under the age of eighteen who is convicted in adult criminal court of a crime and who is committed for a term of confinement in a jail as defined in RCW 70.48.020, must be housed in a jail cell that does not contain adult offenders, until the offender reaches the age of eighteen.