Key Takeaway
New York courts allow learned treatises as evidence when experts recognize publications as standards of care, even without using "authoritative" language.
This article is part of our ongoing experts coverage, with 80 published articles analyzing experts issues across New York State. Attorney Jason Tenenbaum brings 24+ years of hands-on experience to this analysis, drawing from his work on more than 1,000 appeals, over 100,000 no-fault cases, and recovery of over $100 million for clients throughout Nassau County, Suffolk County, Queens, Brooklyn, Manhattan, and the Bronx. For personalized legal advice about how these principles apply to your specific situation, contact our Long Island office at (516) 750-0595 for a free consultation.
How many times have you tried a case where the expert admits that a particular journal has broad support is a standard of care in the community but is not authoritative. The Fourth Department wrote something on this:
“Defendant’s further contention that the court erred in permitting the use of a publication from the American College of Obstetricians and Gynecologists to be used during cross-examination because he did not recognize it as “authoritative” is not preserved for our review because he did not object to the publication on that specific ground (see generally Carr v Burnwell Gas of Newark, Inc., 23 AD3d 998, 998). In any event, it is well settled that the use of scientific works and publications may be used for impeachment purposes during cross-examination if it has been demonstrated that the work is the type of material commonly relied upon in the profession and has been deemed authoritative by such expert (see Lenzini v Kessler, 48 AD3d 220, 220; Egan v Dry Dock, E. Broadway & Battery R.R. Co., 12 App Div 556, 571). Here, defendant recognized the publication as a “standard of care” to which he attempted to “adhere” in his own practice. Although he did not use the word “authoritative” in describing the publication, we note that the modern trend, with which we agree, is to eschew a narrow and rigid reliance upon semantic choices when other words, and the testimony viewed as a whole, convey an equivalent meaning as that in the traditional verbal formulation (see Linton v Nawaz, 62 AD3d 434, 443,affd 14 NY3d 821; Cholewinski v Wisnicki, 21 AD3d 791, 792; see also Matott v Ward, 48 NY2d 455, 460-461). Thus, a physician may “not foreclose full cross-examination by the semantic trick of announcing that he did not find the work authoritative” where he has testified that it is reliable (Spiegel v Levy, 201 AD2d 378, 379, lv denied 83 NY2d 758; see Lenzini, 48 AD3d at 220), especially where, as here, he agreed that it constituted a “standard of care” to which he attempted to “adhere.” Defendant’s further contentions concerning plaintiffs’ cross-examination of the remaining experts are without merit for the same reason.”
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Legal Context
Why This Matters for Your Case
New York law is among the most complex and nuanced in the country, with distinct procedural rules, substantive doctrines, and court systems that differ significantly from other jurisdictions. The Civil Practice Law and Rules (CPLR) governs every stage of civil litigation, from service of process through trial and appeal. The Appellate Division, Appellate Term, and Court of Appeals create a rich and ever-evolving body of case law that practitioners must follow.
Attorney Jason Tenenbaum has practiced across these areas for over 24 years, writing more than 1,000 appellate briefs and publishing over 2,353 legal articles that attorneys and clients rely on for guidance. The analysis in this article reflects real courtroom experience — from motion practice in Civil Court and Supreme Court to oral arguments before the Appellate Division — and a deep understanding of how New York courts actually apply the law in practice.
About This Topic
Expert Testimony in New York Litigation
Expert testimony is essential in most personal injury and no-fault cases — from medical experts establishing causation and damages to accident reconstructionists and economic experts calculating lost earnings. New York courts apply specific rules governing expert qualifications, the foundation for expert opinions, the use of medical journals and treatises, and the sufficiency of expert evidence on summary judgment. These articles analyze the legal standards for expert testimony and practical strategies for presenting and challenging expert evidence.
80 published articles in Experts
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Frequently Asked Questions
How are expert witnesses used in New York personal injury cases?
Expert witnesses provide specialized opinion testimony that helps the court or jury understand complex issues like medical causation, injury severity, future care needs, economic losses, and engineering defects. Under New York law, expert testimony must be based on facts in evidence, the expert's professional knowledge, or a combination of both. The expert must be qualified by training, education, or experience in the relevant field. Expert disclosure requirements under CPLR 3101(d)(1)(i) require parties to identify their experts and provide detailed summaries before trial.
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About the Author
Jason Tenenbaum, Esq.
Jason Tenenbaum is the founding attorney of the Law Office of Jason Tenenbaum, P.C., headquartered at 326 Walt Whitman Road, Suite C, Huntington Station, New York 11746. With over 24 years of experience since founding the firm in 2002, Jason has written more than 1,000 appeals, handled over 100,000 no-fault insurance cases, and recovered over $100 million for clients across Long Island, Nassau County, Suffolk County, Queens, Brooklyn, Manhattan, the Bronx, and Staten Island. He is one of the few attorneys in the state who both writes his own appellate briefs and tries his own cases.
Jason is admitted to practice in New York, New Jersey, Florida, Texas, Georgia, and Michigan state courts, as well as multiple federal courts. His 2,353+ published legal articles analyzing New York case law, procedural developments, and litigation strategy make him one of the most prolific legal commentators in the state. He earned his Juris Doctor from Syracuse University College of Law.
Disclaimer: This article is published by the Law Office of Jason Tenenbaum, P.C. for informational and educational purposes only. It does not constitute legal advice, and no attorney-client relationship is formed by reading this content. The legal principles discussed may not apply to your specific situation, and the law may have changed since this article was last updated.
New York law varies by jurisdiction — court decisions in one Appellate Division department may not be followed in another, and local court rules in Nassau County Supreme Court differ from those in Suffolk County Supreme Court, Kings County Civil Court, or Queens County Supreme Court. The Appellate Division, Second Department (which covers Long Island, Brooklyn, Queens, and Staten Island) and the Appellate Term (which hears appeals from lower courts) each have distinct procedural requirements and precedents that affect litigation strategy.
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