ILCS » Chapter 750 · Act 46
Illinois Compiled Statutes

750 ILCS 46/403 (2026)

Genetic test results

✓ current as of May 2026
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(750 ILCS 46/403)
    Sec. 403. Genetic test results.
    (a) The expert shall prepare a written report of the genetic test results. If the genetic test results show that the alleged genetic parent is not excluded, the report shall contain statistics based upon the statistical formula of combined parentage index (CPI) and the probability of parentage as determined by the probability of exclusion (Random Person Not Excluded = RPNE). The expert may be called by the court as a witness to testify to the expert's findings and, if called, shall be subject to cross-examination by the parties. If the genetic test results show that the alleged genetic parent is not excluded, any party may demand that other experts, qualified as examiners of blood or tissue types, perform independent genetic testing under order of court, including, but not limited to, blood types or other testing of genetic markers. The results of the genetic testing may be offered into evidence. The number and qualifications of the experts shall be determined by the court.
    (b) Documentation of the chain of custody of the blood or tissue samples, accompanied by an affidavit or certification in accordance with Section 1-109 of the Code of Civil Procedure, is competent evidence to establish the chain of custody.
    (c) The report of the genetic test results prepared by the appointed expert shall be made by affidavit or by certification as provided in Section 1-109 of the Code of Civil Procedure and shall be mailed to all parties. A proof of service shall be filed with the court. The verified report shall be admitted into evidence at trial without foundation testimony or other proof of authenticity or accuracy, unless a written motion challenging the admissibility of the report is filed by either party within 28 days of receipt of the report, in which case expert testimony shall be required. A party may not file such a motion challenging the admissibility of the report later than 28 days before commencement of trial. Before trial, the court shall determine whether the motion is sufficient to deny admission of the report by verification. Failure to make that timely motion constitutes a waiver of the right to object to admission by verification and shall not be grounds for a continuance of the hearing to establish parentage.
(Source: P.A. 104-448, eff. 12-12-25.)

    
Notes of Decisions
Cited in 1 case, 2020–2020 · leading case: In re Parentage of A.M., 2020 IL App (5th) 190441-U (Ill. App. Ct. 2020).
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In re Parentage of A.M., 2020 IL App (5th) 190441-U (Ill. App. Ct. 2020). “The McRoys also asserted that the results were insufficient under the Act (750 ILCS 46/403(a) (West 2018)) because the results were not supported by a chain of custody affidavit or certificate.”
— 750 ILCS 46/403(a) — 1 case
In re Parentage of A.M., 2020 IL App (5th) 190441-U (Ill. App. Ct. 2020). “The McRoys also asserted that the results were insufficient under the Act (750 ILCS 46/403(a) (West 2018)) because the results were not supported by a chain of custody affidavit or certificate.”
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