720 ILCS 570/509

    (720 ILCS 570/509) (from Ch. 56 1/2, par. 1509)
    (Text of Section before amendment by P.A. 103-881)
    Sec. 509.

Whenever any court in this State grants probation to any person that the
court has reason to believe is or has been an addict or unlawful possessor
of controlled substances, the court shall require, as a condition of
probation, that the probationer submit to periodic tests by the Department
of Corrections to determine by means of appropriate chemical detection
tests whether the probationer is using controlled substances. The court may
require as a condition of probation that the probationer enter an approved
treatment program, if the court determines that the probationer is addicted
to a controlled substance. Whenever the Prisoner Review Board grants
parole or the Department of Juvenile Justice grants aftercare release to a person believed to have been an
unlawful possessor or addict of controlled substances, the Board or Department shall
require as a condition of parole or aftercare release that the parolee or aftercare releasee submit to appropriate
periodic chemical tests by the Department of Corrections or the Department of Juvenile Justice to determine
whether the parolee or aftercare releasee is using controlled substances.

(Source: P.A. 98-558, eff. 1-1-14; 99-628, eff. 1-1-17.)

(Text of Section after amendment by P.A. 103-881)
Sec. 509.

Whenever any court in this State grants probation to any person that the court has reason to believe is or has a substance use disorder or unlawful possessor of controlled substances, the court shall require, as a condition of probation, that the probationer submit to periodic tests by the Department of Corrections to determine by means of appropriate chemical detection tests whether the probationer is using controlled substances. The court may require as a condition of probation that the probationer enter an approved treatment program, if the court determines that the probationer has a substance use disorder of a controlled substance. Whenever the Prisoner Review Board grants parole or the Department of Juvenile Justice grants aftercare release to a person believed to have been an unlawful possessor or person with a substance use disorder, the Board or Department shall require as a condition of parole or aftercare release that the parolee or aftercare releasee submit to appropriate periodic chemical tests by the Department of Corrections or the Department of Juvenile Justice to determine whether the parolee or aftercare releasee is using controlled substances.

(Source: P.A. 103-881, eff. 1-1-25.)