Paternity Testing Information for the State of Illinois (IL)

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The Illinois Statutes

750 ILCS 45/11

(a) As soon as practicable, the court or Administrative Hearing Officer in an Expedited Child Support System may, and upon request of a party shall, order or direct the mother, child and alleged father to submit to deoxyribonucleic acid (DNA) tests to determine inherited characteristics. If any party refuses to submit to the tests, the court may resolve the question of paternity against that party or enforce its order if the rights of others and the interests of justice so require. 

(b) The tests shall be conducted by an expert qualified as an examiner of blood or tissue types and appointed by the court. The expert shall determine the testing procedures. However, any interested party, for good cause shown, in advance of the scheduled tests, may request a hearing to object to the qualifications of the expert or the testing procedures. The expert appointed by the court shall testify at the pre-test hearing at the expense of the party requesting the hearing, except as provided in subsection (h) of this Section for an indigent party. An expert not appointed by the court shall testify at the pre-test hearing at the expense of the party retaining the expert. Inquiry into an expert's qualifications at the pre-test hearing shall not affect either parties' right to have the expert qualified at trial. 

(c) The expert shall prepare a written report of the test results. If the test results show that the alleged father is not excluded, the report shall contain a combined paternity index relating to the probability of paternity. The expert may be called by the court as a witness to testify to his or her findings and, if called, shall be subject to cross-examination by the parties. If the test results show that the alleged father is not excluded, any party may demand that other experts, qualified as examiners of blood or tissue types, perform independent tests under order of court, including, but not limited to, blood types or other tests of genetic markers such as those found by Human Leucocyte Antigen (HLA) tests. The results of the tests may be offered into evidence. The number and qualifications of the experts shall be determined by the court. 

(d) 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. 

(e) The report of the 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 determine paternity. 

(f) Tests taken pursuant to this Section shall have the following effect: (1) If the court finds that the conclusion of the expert or experts, as disclosed by the evidence based upon the tests, is that the alleged father is not the parent of the child, the question of paternity shall be resolved accordingly. (2) If the experts disagree in their findings or conclusions, the question shall be weighed with other competent evidence of paternity. (3) If the tests show that the alleged father is not excluded and that the combined paternity index is less than 500 to 1, this evidence shall be admitted by the court and shall be weighed with other competent evidence of paternity. (4) If the tests show that the alleged father is not excluded and that the combined paternity index is at least 500 to 1, the alleged father is presumed to be the father, and this evidence shall be admitted. This presumption may be rebutted by clear and convincing evidence. 

(g) Any presumption of parentage as set forth in Section 5 of this Act is rebutted if the court finds that the conclusion of the expert or experts excludes paternity of the presumed father.

This information is provided for reference only