Montez Anderson was convicted in 2012 of attempt (first degree murder) and armed robbery with a firearm, committed when he was 18 years old, and sentenced to consecutive terms totaling 49 years. After an unsuccessful direct appeal and a summarily dismissed initial postconviction petition, Anderson sought leave in 2024 to file a successive postconviction petition through retained counsel, arguing that newly available neuroscientific research on young adult brain development provided cause for his failure to raise an Eighth Amendment and proportionate penalties clause challenge in earlier proceedings. The circuit court denied leave, relying on People v. Moore, 2023 IL 126461, and the appellate court affirmed.

The central issue on appeal was whether previously unavailable neuroscientific research on young adult brain development constitutes an objective factor external to the defense sufficient to establish 'cause' under the cause-and-prejudice test. The court held it does not. Relying on Moore, Clark, Haines, and French, the court reasoned that Illinois law had long recognized developmental differences between young adults and older adults, meaning a proportionate penalties clause claim was always raisable in some form using defendant's own age, background, and personal history. The emergence of stronger scientific support for an already-raisable claim is not cause. The court also rejected defendant's reliance on Blalock, Prante, Robinson, and Mitchell as inapposite or factually distinguishable.

For practitioners, this decision reinforces that the unavailability of better supporting evidence — including evolving neuroscience — will not satisfy the cause prong where the underlying claim was previously buildable. Defense attorneys pursuing successive petitions on young adult sentencing grounds must identify a truly external, previously unobtainable impediment beyond incremental scientific development.

Shawn Kubina was charged in Fayette County with aggravated criminal sexual abuse and battery in August 2021. The State later filed two counts of criminal sexual assault in March 2023, with a grand jury indictment following in January 2024. Trial commenced days later; the State dismissed the original charges and proceeded solely on the sexual assault counts. The jury convicted Kubina on both counts, the court merged them, and sentenced him to eight years. On appeal, Kubina argued trial counsel was ineffective for failing to file a written speedy trial demand, which — under compulsory joinder principles — would have triggered the 160-day statutory clock and potentially required dismissal of the later-filed sexual assault charges if filed outside that window.

The Fifth District assumed without deciding that counsel's failure to file a written demand satisfied Strickland's performance prong, but found the prejudice prong dispositive. The court held that Kubina's argument was impermissibly speculative because it rested entirely on the assumption that the State would have filed the additional charges beyond 160 days regardless of a written demand. The court emphasized that a defendant must affirmatively prove a reasonable probability of a different outcome — not merely identify a conceivable effect — and that nothing in the record suggested the State would have failed to act within the statutory period had a demand been filed.

This decision reinforces that ineffective assistance claims premised on an opponent's hypothetical inaction face a high prejudice burden. Defense counsel advancing similar speedy trial or compulsory joinder IAC arguments must develop a factual record demonstrating why the State would not have adjusted its strategy in response to a timely demand.