State of Missouri v. Rachel A. Kinsella, 578 S.W.3d 802

Child P.K., medically complex, treated in Kansas City (Risperdal, Trileptal) and later at St. Louis Children’s Hospital (Seroquel, Clobazam); the two teams were kept unaware of each other.
From March 2014–Jan 2015 defendant repeatedly obtained refills of Risperdal and Trileptal from Kansas City while P.K. was receiving replacement drugs in St. Louis; toxicology later showed both discontinued drugs in P.K.’s blood at dangerous levels.
P.K. experienced waxing/waning episodes of extreme unresponsiveness, ataxia, hallucinations, required prolonged hospitalizations, pheresis (plasmapheresis) and ventilatory support; he improved rapidly after defendant was excluded from access.
St. Louis doctors concluded P.K. was being poisoned by overlapping/inappropriate medication dosing; they diagnosed medical child abuse by poisoning and contacted child protective services.
Defendant was convicted by a jury of first-degree assault (knowingly causing serious physical injury by poisoning) and first-degree endangering the welfare of a child (intentionally poisoning and creating substantial risk); sentenced to concurrent prison terms. On appeal she challenged sufficiency of evidence that she acted knowingly or intentionally.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Sufficiency that defendant acted "knowingly" (first-degree assault)	Evidence of deception, medical sophistication, repeated refills, observed deterioration while she administered meds, positive toxicology, improvement after restricting her access supports an inference she was aware her conduct was practically certain to cause serious injury	Conviction rests on impermissible "inference stacking"; proof does not directly show she knew the drugs would practically certainly injure P.K.	Court affirmed: circumstantial evidence and parallel inferences (deception, competence, refill patterns, observed effects, motive) reasonably support knowledge; no impermissible attenuation
Sufficiency that defendant acted "intentionally"/purposely (endangering child)	Pattern of refills and deliberate deception about care, plus possible financial motive, support finding her conscious object was to administer drugs and cause illness	Argues evidence consistent with negligence/accident rather than a conscious objective to harm	Court affirmed: jury could infer purposeful conduct from repeated deceptive behavior, continued administration of discontinued drugs, and financial motive

State v. Naylor, 510 S.W.3d 855 (Mo. banc 2017) (standard of review for sufficiency of the evidence)
State v. Newberry, 605 S.W.2d 117 (Mo. 1980) (credibility and weight of evidence for jury)
State v. Nash, 339 S.W.3d 500 (Mo. banc 2011) (rational-factfinder sufficiency test)
State v. Putney, 473 S.W.3d 210 (Mo. App. E.D. 2015) (discussion of "inference-stacking" and parallel inferences)
State v. McMullin, 136 S.W.3d 566 (Mo. App. E.D. 2004) (limits on basing convictions on speculation and insufficient inferences)