People v. Casler, 181 N.E.3d 767

Defendant Rasheed Casler was charged (count III) with obstructing justice for giving police the name "Jakuta King Williams" while in a hotel bathroom when officers were at the door; police later identified him and arrested him on an outstanding warrant.
At trial the State presented officer testimony about smelling cannabis, the bathroom encounter, and that dispatch later confirmed defendant had an outstanding warrant; defendant testified he was intoxicated, thought someone was joking, and did not intend to avoid arrest.
The jury acquitted on drug counts but convicted on the obstructing-justice count; defendant was sentenced to 90 days jail and two years’ probation.
On appeal the Fifth District affirmed; the central contested legal question was whether a prosecution under 720 ILCS 5/31-4(a)(1) for furnishing false information requires proof that the false information materially impeded the administration of justice.
The Illinois Supreme Court reversed: it held the statute requires a material-impediment element, found the trial court excluded evidence and instructions on that element, and remanded for further proceedings (rejecting a double-jeopardy bar to retrial).

Issue	Plaintiff's Argument	Defendant's Argument	Held
Whether 720 ILCS 5/31-4(a)(1) (furnishing false information) requires proof that the false information materially impeded the administration of justice	The statute criminalizes knowingly supplying false information with the requisite intent; no separate "material impediment" element is required	"Furnish" implies the information must be necessary/useful — i.e., relied upon or materially impede the investigation	Yes. The Court held the statute requires that the false information materially impeded the administration of justice (a material-impediment element).
Whether retrial is barred by double jeopardy because the evidence at trial did not address material impediment	The evidence (officers’ testimony and events) shows defendant’s conduct did materially impede or at least supports retrial	The State failed to prove material impediment at trial; exclusion of such evidence and absence of instruction make evidence insufficient — defendant entitled to acquittal	Retrial is permitted. The Court treated reversal as for trial error (post-trial clarification of elements) and remanded for further proceedings; double jeopardy does not bar retrial.

People v. Comage, 241 Ill. 2d 139 (Ill. 2011) (construed "conceal" in §31-4(a) to require actual interference — i.e., material impediment — to sustain an obstructing-justice conviction)
People v. Davis, 409 Ill. App. 3d 457 (Ill. App. Ct. 2011) (appellate decision discussing scope of Comage in a false-information case)
People v. Baskerville, 2012 IL 111056 (Ill. 2012) (held furnishing false information can constitute obstruction of a peace officer only if it actually impedes an authorized act)
Jackson v. Virginia, 443 U.S. 307 (U.S. 1979) (standard for reviewing sufficiency of the evidence under due process)
Burks v. United States, 437 U.S. 1 (U.S. 1978) (double jeopardy bars retrial when conviction is reversed solely for insufficiency of the evidence)
People v. McKown, 236 Ill. 2d 278 (Ill. 2010) (discussed double-jeopardy principles and retrial after appellate reversal)