Also known as: empirical evidences · scientific evidence
Written by attorneys · grounded in primary & secondary sources — see below
Factual information derived from systematic observation, experimentation, or statistical analysis. Courts and litigants invoke it to test the reliability of expert methodologies or to evaluate the real-world effects of legal rules.
Eva Espinosa sued Elemental Pharmaceuticals after her child developed birth defects allegedly linked to a medication. Her experts relied on animal studies and chemical-structure analogies. The court examined whether those methods had been tested, published, and accepted in the field before admitting the testimony.
Ezra Eastman, a high-school senior, challenged his federal conviction for possessing a firearm near school grounds. The government cited studies showing guns disrupt education and harm economic productivity. The Court weighed whether those studies established a sufficient connection to interstate commerce.
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Elliot Edmonds moved to suppress evidence seized during an unlawful search of his apartment. The government argued that exclusion would not deter misconduct. The court reviewed available studies on police behavior and concluded the data neither clearly supported nor refuted a deterrent effect.
Enigma Technologies sought to air a documentary critical of a candidate shortly before an election. The government defended existing spending restrictions by pointing to historical patterns of corporate influence. The Court noted the absence of systematic data showing that independent expenditures corrupt elected officials.
Esme Ellington, a journalist, refused to reveal her confidential sources to a grand jury investigating criminal activity. She argued that compelled disclosure would dry up information flows. The Court found no systematic studies demonstrating that journalists' sources would stop cooperating if identities were occasionally revealed.
Eclipse Manufacturing moved to close a criminal trial involving a minor victim. The state cited concerns about publicity harming the child. The Court examined whether studies or data supported the claim that closure would meaningfully protect victims or improve testimony quality.
Courts assess whether an expert's theory or method has been tested, subjected to peer review, shown to have a known error rate, and generally accepted in the relevant field. These inquiries help determine whether the testimony rests on reliable foundations rather than untested assertions.
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Yes. Courts have upheld or struck down laws even when one side lacked systematic data, provided the legal standard is otherwise satisfied. The absence of empirical support may weaken a party's position but does not automatically defeat it.
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No. Courts have applied the exclusionary rule despite inconclusive data on its deterrent effect. The rule's justification rests on broader considerations of judicial integrity and constitutional enforcement, not solely on statistical proof of deterrence.
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…acute threat to the educational process—the possession (and use) of life-threatening firearms in, or near, the classroom. The empirical evidence that I have discussed above unmistakably documents the special way in which guns and education are incompatible. See supra , at 619. This Court has previously recognized the singularly…