Authorizes an offender, who is sentenced under chapter 9.94A RCW (the sentencing reform act of 1981) or chapter 9.94B RCW (sentencing with regard to crimes committed before July 1, 2000) and is supervised by the department of corrections, to earn positive achievement time in accordance with procedures that are developed and adopted by the department.

Authorizes the department of corrections to reduce the period of time an offender is supervised by the earned award of positive achievement time.

Gives discretion to the department of corrections to implement this act over a period of time not to exceed twenty-one months.