MCL § 600.2955 – Admissibility of scientific opinion (Daubert standards for experts)
Table of Contents
Code Details
Chapter 600
Act 236 of 1961
236-1961-29
Exact Statute Text
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600.2955 Scientific or expert opinion or evidence; admissibility.
Sec. 2955.
(1) In an action for the death of a person or for injury to a person or property, a scientific opinion rendered by an otherwise qualified expert is not admissible unless the court determines that the opinion is reliable and will assist the trier of fact. In making that determination, the court shall examine the opinion and the basis for the opinion, which basis includes the facts, technique, methodology, and reasoning relied on by the expert, and shall consider all of the following factors:
(a) Whether the opinion and its basis have been subjected to scientific testing and replication.
(b) Whether the opinion and its basis have been subjected to peer review publication.
(c) The existence and maintenance of generally accepted standards governing the application and interpretation of a methodology or technique and whether the opinion and its basis are consistent with those standards.
(d) The known or potential error rate of the opinion and its basis.
(e) The degree to which the opinion and its basis are generally accepted within the relevant expert community. As used in this subdivision, “relevant expert community” means individuals who are knowledgeable in the field of study and are gainfully employed applying that knowledge on the free market.
(f) Whether the basis for the opinion is reliable and whether experts in that field would rely on the same basis to reach the type of opinion being proffered.
(g) Whether the opinion or methodology is relied upon by experts outside of the context of litigation.
(2) A novel methodology or form of scientific evidence may be admitted into evidence only if its proponent establishes that it has achieved general scientific acceptance among impartial and disinterested experts in the field.
(3) In an action alleging medical malpractice, the provisions of this section are in addition to, and do not otherwise affect, the criteria for expert testimony provided in section 2169.
MCL § 600.2955 Summary
This Michigan statute outlines the criteria for admitting scientific or expert opinions in legal cases involving personal injury, death, or property damage. It mandates that for a scientific opinion from a qualified expert to be allowed in court, the judge must first determine if the opinion is reliable and if it will help the jury or judge understand the facts of the case. The court makes this determination by evaluating the expert’s opinion and the foundation for it, including the facts, methods, and reasoning used.
To assess reliability, the court must consider seven specific factors. These include whether the opinion and its underlying methods have been scientifically tested and replicated, subjected to peer review, conform to generally accepted standards in the field, and have a known error rate. The court also examines how widely accepted the opinion is within the relevant expert community (defined as knowledgeable individuals applying their expertise in the free market), whether the basis for the opinion is reliable, and if experts typically rely on such a basis outside of litigation. The statute also sets a higher bar for “novel” scientific methods or evidence, requiring them to have general acceptance among impartial experts. Finally, it clarifies that these rules supplement, rather than replace, the specific expert testimony requirements for medical malpractice cases outlined in MCL § 600.2169.
Purpose of MCL § 600.2955
The legislative intent behind this particular Michigan statute is to ensure the integrity and reliability of expert testimony presented in civil trials. It addresses the crucial problem of “junk science” potentially swaying juries by providing a rigorous framework, often referred to as the Daubert standard, for courts to screen scientific and technical expert opinions. By setting clear guidelines for admissibility, the law aims to prevent speculative or unproven theories from being presented as factual evidence, thereby safeguarding the fairness and accuracy of legal proceedings. This ensures that expert opinions are not only relevant but also grounded in sound scientific principles and methodologies, promoting justice and maintaining public confidence in the judicial system.
Real-World Example of MCL § 600.2955
Imagine a car accident case where the plaintiff, Sarah, suffered a severe spinal injury. Her attorney wants to introduce the testimony of Dr. Emily Thorne, an orthopedic surgeon, who will explain how the forces involved in the collision directly caused Sarah’s specific spinal disc herniation, using a novel biomechanical analysis method.
The defense attorney challenges Dr. Thorne’s testimony, arguing it does not meet the standards of MCL § 600.2955. During a pretrial hearing, the judge applies the factors:
- Testing and Replication: The judge asks if Dr. Thorne’s specific biomechanical model for spinal injury causation has been subjected to independent testing and if other researchers have replicated its findings.
- Peer Review: The court inquires whether Dr. Thorne’s methodology or research using it has been published in peer-reviewed scientific journals.
- Standards: The judge assesses if Dr. Thorne’s analysis adheres to established biomechanical engineering standards for accident reconstruction and injury causation.
- Error Rate: The court asks about the known or potential error rate of Dr. Thorne’s specific analytical technique.
- General Acceptance: The judge determines the degree to which this novel biomechanical causation model is accepted within the broader orthopedic and biomechanical engineering communities, especially among those not involved in litigation.
- Reliable Basis: The court examines whether Dr. Thorne’s underlying data and assumptions are reliable and if other experts in her field would typically rely on similar data to draw conclusions about injury mechanisms.
- Non-Litigation Use: The judge investigates whether Dr. Thorne’s specific methodology is used in other contexts outside of legal cases, such as in automotive safety research or clinical diagnostics.
If the judge finds that Dr. Thorne’s opinion, particularly her novel methodology, lacks sufficient scientific rigor based on these factors (especially general scientific acceptance for a novel method), her testimony might be excluded, significantly impacting Sarah’s ability to prove causation for her injuries.
Related Statutes
MCL § 600.2169: This statute, directly referenced in subsection (3) of MCL § 600.2955, outlines specific, additional requirements for expert testimony in medical malpractice actions. It details qualifications for medical experts, often requiring them to be practicing in the same specialty as the defendant and to have devoted a certain percentage of their professional time to clinical practice or teaching. MCL § 600.2955 acts in conjunction with, rather than replacing, these specialized criteria.
Michigan Rule of Evidence (MRE) 702: This general rule of evidence governs testimony by expert witnesses. While MCL § 600.2955 focuses specifically on the admissibility of *scientific* opinions and establishes the Daubert-like framework for reliability, MRE 702 provides the foundational requirement that an expert’s specialized knowledge must “help the trier of fact to understand the evidence or to determine a fact in issue.” MCL § 600.2955 elaborates on how to assess the reliability component for scientific and technical expertise, making it a more specific application of the broader MRE 702 principles within Michigan courts.
Case Law Interpreting MCL § 600.2955
A significant Michigan Supreme Court case interpreting the application of expert testimony standards, which MCL § 600.2955 codifies and clarifies, is *In re Certified Question from the U.S. Court of Appeals for the Sixth Circuit*, 499 Mich. 110, 878 N.W.2d 465 (2016). This case provided important guidance on the role of the trial court as a gatekeeper under the state’s expert witness admissibility rules.
[Link to Google Scholar Search for *In re Certified Question from the U.S. Court of Appeals for the Sixth Circuit*] (https://scholar.google.com/scholar?q=%22In+re+Certified+Question+from+the+U.S.+Court+of+Appeals+for+the+Sixth+Circuit%22+499+Mich.+110)
Why MCL § 600.2955 Matters in Personal Injury Litigation
MCL § 600.2955 is a cornerstone of personal injury litigation in Michigan, critically shaping how expert evidence is presented and received in court. For plaintiffs, this statute underscores the vital importance of selecting highly qualified experts whose opinions are not only relevant but also demonstrably reliable under the stringent Daubert standards. Attorneys representing injured individuals must meticulously vet their expert witnesses to ensure their methodologies are scientifically sound, peer-reviewed, and widely accepted, as failure to meet these benchmarks can lead to the exclusion of crucial testimony, potentially jeopardizing the entire case.
Conversely, for defense attorneys, this law provides a powerful tool to challenge opposing experts. It allows them to scrutinize the scientific basis, testing, error rates, and general acceptance of a plaintiff’s expert opinions, effectively weeding out speculative or unsubstantiated claims. Successfully challenging an expert’s testimony under this statute can significantly weaken a plaintiff’s case on issues like causation or damages. Both sides must understand and strategically apply MCL § 600.2955 throughout discovery, expert witness depositions, and pretrial motions to ensure that only credible, scientifically valid evidence informs the trier of fact. This statute directly impacts litigation strategies, expert witness budgets, and ultimately, the outcomes of personal injury claims in Michigan.