ILCS » Chapter 725 · Act 205
Illinois Compiled Statutes

725 ILCS 205/1.01 (2026)

As used in this Act:     All persons suffering from a mental disorder, which mental disorder has existed for a period of not less than one year, immediately prior to the filing of the petition hereinafter provided for, coupled with criminal propensities to the commission of sex offenses, and who have demonstrated propensities toward acts of sexual assault or acts of sexual molestation of children, are hereby declared sexually dangerous persons

✓ current as of May 2026
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(725 ILCS 205/1.01) (from Ch. 38, par. 105-1.01)
    Sec. 1.01. As used in this Act:
    All persons suffering from a mental disorder, which mental disorder has existed for a period of not less than one year, immediately prior to the filing of the petition hereinafter provided for, coupled with criminal propensities to the commission of sex offenses, and who have demonstrated propensities toward acts of sexual assault or acts of sexual molestation of children, are hereby declared sexually dangerous persons.
(Source: Laws 1955, p. 1144.)

    
Notes of Decisions
Cited in 132 cases (20 in the last 5 years), 1995–2025 · leading case: People v. Lawton, 818 N.E.2d 326 (Ill. 2004).
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People v. Lawton, 818 N.E.2d 326 (Ill. 2004). · cites it 4× “In the case before us, the court appointed Dr. Phillip Bornstein and Dr.”
People v. Holmes, 2016 IL App (1st) 132357 (Ill. App. Ct. 2016). · cites it 3× “Even apart from the personality disorder NOS diagnosis, there was ample evidence that defendant had a mental disorder, a required finding for civil commitment (725 ILCS 205/1.01 (West 2010)). Dr. Stanislaus also diagnosed defendant with sexual sadism based on defendant's arousal…”
People v. Masterson, 798 N.E.2d 735 (Ill. 2003). · cites it 5× “01 of the Sexually Dangerous Persons Act (SDPA) (725 ILCS 205/1.01 (West 1998)). After a hearing on the State’s petition, the circuit court declared respondent a sexually dangerous person and ordered his commitment.”
People v. Bailey, 937 N.E.2d 731 (Ill. App. Ct. 2010). · cites it 8× “Justice CARTER delivered the opinion of the court: After a bench trial, defendant, Christopher Bailey, was found to be a sexually dangerous person (725 ILCS 205/1.01, 3 (West 2008)) and was committed to the Department of Corrections for an indefinite period for treatment.”
People v. Burns, 809 N.E.2d 107 (Ill. 2004). · cites it 2× “725 ILCS 205/1.01 (West 2000). Proceedings under the SDPA are civil in nature (725 ILCS 205/3.”
People v. Trainor, 785 N.E.2d 568 (Ill. App. Ct. 2003). · cites it 5× “Within this argument, the respondent raises two sub-issues: (1) Mark Carich is not a qualified psychologist under the Sexually Dangerous Persons Act (Act) (725 ILCS 205/1.01 et seq. (West 2000)); and (2) the socio-psychiatric report was not signed by a sociologist as required…”
People v. McVeay, 706 N.E.2d 539 (Ill. App. Ct. 1999). · cites it 3× “” 725 ILCS 205/1.01 (West 1996). In section 5 of the Sexually Violent Persons Commitment Act, our legislature defines “sexually violent person” as follows: “[A] person who has been convicted of a sexually violent offense, has been adjudicated delinquent for a sexually violent…”
In Re Det. of Hughes, 805 N.E.2d 725 (Ill. App. Ct. 2004). · cites it 3× “2d at 318 , quoting 725 ILCS 205/1.01 (West 1998). After concluding “that section 1.”
People v. Trainor, 752 N.E.2d 1055 (Ill. 2001). “725 ILCS 205/1.01 (West 1998). The Act’s purpose is twofold: (1) to protect the public by sequestering a sexually dangerous person until such a time as the individual is recovered and released, and (2) to subject sexually dangerous persons to treatment such that the individual…”
Charles Peter Allison v. Donald N. Snyder, Jr., Mark S. Carich, & Michael L. Holmes, 332 F.3d 1076 (7th Cir. 2003). “The Illinois Sexually Dangerous Persons Act, 725 ILCS 205/1.01 to 12, is described, and sustained against one constitutional challenge, in Allen v.”
People v. Kallal, 2019 IL App (4th) 180099 (Ill. App. Ct. 2019). · cites it 2× “01 of the Act ( 725 ILCS 205/1.01 (West 2016) ). Masterson , 207 Ill.”
People v. Donath, 2013 IL App (3d) 120251 (Ill. App. Ct. 2013). · cites it 2× “725 ILCS 205/1.01, 8 (West 2008). ¶5 On February 9, 2009, respondent filed a pro se application for discharge or conditional release from commitment, alleging that he had recovered.”
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