2021 IL App (5th) 200074
Ill. App. Ct.2021Background
- John Prante was convicted in 1983 of the 1978 murder of Karla Brown and sentenced to an extended term of 75 years after a jury trial that relied in part on forensic odontology (bite-mark) testimony.
- The body was exhumed in 1982; State experts testified the marks on the victim’s shoulder were human bite marks and that Prante’s dentition was "consistent" with them; defense experts challenged the photos and methodology.
- Prante was convicted largely on circumstantial evidence and statements by acquaintances that he described details of the body; bite-mark testimony served as apparent scientific corroboration.
- Decades later scientific authorities (NAS 2009; Texas Forensic Science Commission 2016; PCAST 2016) and forensic literature cast serious doubt on the validity and reliability of bite-mark comparison testimony.
- Prante filed a motion for leave to file a successive postconviction petition asserting (1) cause and prejudice based on new scientific evidence repudiating bite-mark science, and (2) actual innocence; the circuit court denied leave.
- The appellate court reversed the denial as to cause and prejudice (permitting filing of the successive petition) but affirmed denial as to actual innocence; the case was remanded for further proceedings.
Issues
| Issue | Plaintiff's Argument (People) | Defendant's Argument (Prante) | Held |
|---|---|---|---|
| Whether Prante established cause and prejudice to file a successive postconviction petition based on new scientific evidence undermining bite-mark comparisons | The State argued bite-mark evidence remained admissible in Illinois and that other circumstantial evidence (including incriminating statements) prevented prejudice | Prante argued that recent scientific repudiation of bite-mark comparison satisfies cause (new objective factor) and prejudice (due-process violation) | Court held Prante established prima facie cause and prejudice; remanded to permit filing of the successive petition |
| Whether bite-mark comparison testimony is "scientific evidence" requiring Frye general-acceptance analysis | The State relied on older Illinois authority treating bite-mark comparisons as admissible visual comparisons | Prante argued bite-mark analysis is scientific and must meet Frye; recent science shows it lacks general acceptance | Court held bite-mark comparison is "scientific evidence" under Frye and Illinois courts must apply Frye to this methodology |
| Whether the new scientific evidence is newly discovered, material, noncumulative, and conclusive of actual innocence | The State argued even if bite-mark science is undermined, other trial evidence (statements, opportunity) remains strong; some evidence that marks existed could still be admitted | Prante argued the repudiation of bite-mark comparison would remove the scientific corroboration of witnesses’ claims and likely change a jury’s verdict | Court held the scientific evidence was new, material and noncumulative but not sufficiently conclusive to meet the high actual-innocence standard; denial as to actual innocence affirmed |
| Whether the circuit court erred in denying leave to file the successive postconviction petition | The State contended denial was proper because bite-mark testimony did not render trial fundamentally unfair and circumstantial evidence sufficed | Prante contended the denial improperly applied res judicata and failed to account for new scientific developments | Court held the circuit court erred in denying leave on the cause-and-prejudice ground and reversed/remanded for further proceedings; actual-innocence claim denied |
Key Cases Cited
- Frye v. United States, 293 F. 1013 (D.C. Cir. 1923) (admissibility requires general acceptance of scientific method)
- Donaldson v. Cent. Ill. Pub. Serv. Co., 199 Ill. 2d 63 (Ill. 2002) (Illinois adopts Frye general-acceptance test for scientific expert evidence)
- Milone v. People, 43 Ill. App. 3d 385 (Ill. App. 1976) (earlier Illinois decision admitting bite-mark evidence as visual comparison)
- People v. Ferguson, 172 Ill. App. 3d 1 (Ill. App. 1988) (rejecting Milone’s limited Frye approach and applying Frye to contested identification science)
- People v. McKown, 226 Ill. 2d 245 (Ill. 2007) (distinguishing scientific from nonscientific expert evidence)
- People v. Robinson, 2020 IL 123849 (Ill. 2020) (standards for successive postconviction petitions; cause/prejudice and actual-innocence tests)