The governor will sign the bill Thursday morning at the Rescue Mission in Trenton.
The legislation expands eligibility for the state's drug court program and mandates that nonviolent, drug-dependent offenders receive treatment rather than prison time. It phases in a statewide program over a five-year period, beginning with at least three counties in the first year.
The Legislature and the governor will receive yearly reports on the program, including completion and revocation rates, recidivism rates and costs.
Christie, a former federal prosecutor, has spoken in favor of treatment rather than prison time for drug addicts.
