Sissoko v. State, 182 A.3d 874

Background

In 2001 an 11‑week‑old, Shane, was found comatose with bilateral subdural and subarachnoid hemorrhages, diffuse retinal hemorrhages, and progressive cerebral edema; he died ten days later. The only adult present during the interval was the father, Moussa Sissoko.
Sissoko was originally convicted in 2002 of first‑degree murder, child abuse, and child abuse resulting in death; convictions were vacated on post‑conviction review because trial counsel failed to present rebuttal expert testimony.
Prior to retrial the defendant moved to exclude the State’s expert testimony diagnosing abusive head trauma (AHT, formerly “shaken baby syndrome”), arguing the diagnosis is no longer generally accepted absent external injuries and relies on an unreliable application of the “triad.”
The trial court held a multi‑day Frye‑Reed hearing and denied the motion, also finding admissibility under Maryland Rule 5‑702; the defendant elected a bench trial and was convicted again.
On appeal the court addressed whether Frye‑Reed (general acceptance) or Rule 5‑702 (reliable methodology / factual basis) controlled, reviewed the literature and expert methods, and considered whether an ‘‘analytical gap’’ existed between methods and conclusions.
The Court of Special Appeals affirmed: AHT remains a generally accepted diagnosis when internal findings are unexplained by medical causes or history, the State’s experts used an accepted differential‑diagnosis methodology without an analytical gap, and the evidence was legally sufficient to support convictions.

Issues

Issue	Plaintiff's Argument	Defendant's Argument	Held
Admissibility standard — Frye‑Reed vs Rule 5‑702	Sissoko: AHT diagnosis is now controversial and not generally accepted; Frye‑Reed exclusion required for AHT testimony as a general matter	State: This is a Rule 5‑702 factual‑basis challenge (sufficiency of experts’ facts/reasoning); Frye‑Reed not implicated; any Rule 5‑702 ruling was not appealed	Court: Frye‑Reed and Rule 5‑702 overlap; because challenge was general (not case‑specific), Frye‑Reed properly applied and reviewed de novo; no error admitting AHT testimony
Reliability of AHT diagnosis / analytical gap	Sissoko: Experts rely on the ‘‘triad’’ and biomechanics controversy leaves an analytical gap — diagnosis unreliable absent external trauma	State: AHT diagnosis is widely supported across relevant specialties; experts used differential‑diagnosis and excluded medical mimics; no analytical gap	Court: The State’s experts used accepted methods, ruled out alternatives, and did not exhibit an analytical gap; AHT remains generally accepted when internal findings are unexplained by history or disease
Admissibility under Rule 5‑702 (factual basis/methodology)	Sissoko: Even if methodology is accepted, the experts lacked a reliable factual basis to rule out medical causes in this case	State: Experts had adequate data, testing, and literature to support opinions; Rule 5‑702 discretionary finding unchallenged on appeal	Court: The analyses satisfied the Rule 5‑702(3) reliability/factual‑basis requirements; trial court did not abuse discretion
Sufficiency of the evidence	Sissoko: If AHT is discredited, conviction based solely on that diagnosis cannot stand	State: Medical proof of inflicted head trauma plus non‑medical proof (opportunity, motive, lies, insurance purchase) sustains convictions beyond reasonable doubt	Court: Viewing evidence in light most favorable to State, expert causation + circumstantial evidence sufficed to support convictions

Key Cases Cited

Frye v. United States, 293 F. 1013 (D.C. Cir. 1923) (establishes original general‑acceptance test for novel scientific evidence)
Reed v. State, 283 Md. 374 (Md. 1978) (Maryland adoption of Frye general‑acceptance framework)
Daubert v. Merrell Dow Pharm., 509 U.S. 579 (U.S. 1993) (FRE 702 reliability inquiry and non‑exclusive factors replacing Frye in federal courts)
Gen. Elec. Co. v. Joiner, 522 U.S. 136 (U.S. 1997) (analytical‑gap doctrine; trial courts may exclude expert opinions lacking adequate connection to data)
Clemons v. State, 392 Md. 339 (Md. 2006) (CBLA lost general acceptance; example of exclusion when community rejects method)
Blackwell v. Wyeth, 408 Md. 575 (Md. 2009) (requires that generally accepted methods also be coupled with generally accepted analysis; rejects opinions with analytical gaps)
Chesson v. Montgomery Mut. Ins. Co., 434 Md. 346 (Md. 2013) (applies Joiner/Daubert analytical‑gap concept under Frye‑Reed to exclude flawed differential‑diagnosis application)
Savage v. State, 455 Md. 138 (Md. 2017) (reaffirms analytical‑gap scrutiny for expert conclusions and notes overlap between Frye‑Reed and Rule 5‑702)
Rochkind v. Stevenson, 454 Md. 277 (Md. 2017) (clarifies Rule 5‑702’s factual‑basis subcomponents: adequate data and reliable methodology)