¶ 1 This аppeal presents the issue of whether common membership in a mutual medical malpractice insurance company can be used to impeach a defense expert in a medical malpractice action. It is an issue of first imрression. Other assignments of error have been raised. However, under the facts of this case no reversible error has been demonstrated.
¶ 2 This is a wrongful death ease in which Plaintiffs, Randy and John Mills, claim that Defendant, Dr. Martin H. Grotheer, M.D., was negligent in his care of their mоther. At trial, Plaintiffs sought to impeach Defendant’s expert witness, also a physician, by demonstrating financial bias. Specifically, they wished to question him concerning his membership in Defendant’s mutual insurance company, 1 Physicians Liability Insurance Company (PLICO). PLICO is opеn to members of the Oklahoma State Medical Association. 2 The trial court granted Defendant’s motion in limine and prohibited any mention of PLICO at trial to impeach the defense witness. Trial of this case resulted in a jury verdict for Defendant.
I.
¶3 The trial court is permitted broad discretion in determining the relevаnce of evidence. Decisions regarding relevance of evidence and its alleged prejudice to the other party will not be overturned absent an abuse of discretion.
Jordan v. Cates,
¶4 The Oklahoma Evidence Code provides that all relevant evidеnce is admissible unless excluded by rules of evidence,
*542
statute, or constitution. Okla. Stat. tit. 12, § 2402 (1991). By statute, the existence of liability insurance is never relevant to the issue of a defendant’s negligence or wrongful action.
Id.
at § 2411. Credibility of a witness, however, is always relevant.
See Frierson v. Hines,
¶ 5 Oklahoma is not the first jurisdiction to confront this issue. Only one jurisdiction has adopted a
per se
rule in favor of the admission of such evidence.
See Ede v. Atrium South OB-GYN, Inc.,
¶ 6 Under thе connections test, a plaintiff must be able to establish that an expert has more connection to a defendant’s insurer than that of policyholder, or in the case of a mutual insurance company, membership. As the Alabama Supreme Court reasoned:
The potential for bias on the part of any witness due to his coverage under a professional liability policy is so remote as to be virtually non-existent. When this remote potential for bias is balanced against the overwhelming prejudicial effect of allowing evidence of professional liability insurance, it becomes evident that admission of such evidence would be error.
Otwell,
¶ 7 Something “[bjeyond mere payment in exchange for testimony [at] trial” must be established.
Strain,
¶ 8 The rationale put forward by the preponderance of jurisdictions that havе addressed the issue persuades this Court to adopt the connections test. By it, a trial court must determine when an expert’s connection to a defendant’s insurer is probative enough to substantially outweigh the prejudice to defendant resulting from the jury’s knowlеdge that defendant carries liability insurance.
¶ 9 Utilizing the connections test, a trial judge should “[i]n all but the exceptional case ... hold that the danger of prejudice resulting from the interjection of insurance evidence substantially outweighs the probative value of evidence that the witness and a party have a common insurer.”
Barsema,
¶ 10 In short, unless it is shown that a witness has a substantial connection with the business of the common insurer, there is no basis for discrediting a person’s testimony for bias derived from interest in the common insurer’s business. Without a substantial connection, there is no basis for allowing the common insurer’s status to be disclosed to the jury.
¶ 11 This Court’s review of the record reveals no abuse of the trial court’s discretion in granting Defendant’s motion to exclude any reference to liability insurance under the facts and circumstances of this ease. The exрert’s connection to Defendant’s insurer was essentially one of policyholder. The requisite degree of connection justifying admissibility was not demonstrated.
*544 II.
¶ 12 Plaintiffs also assert error in the trial court’s refusal to sustain their objection to defense counsel’s use of the terms “guilty” and “convict” during closing arguments. They argue that these terms are never appropriate in a civil action for negligence. They assert that the use of these terms resulted in a defense verdict based on passion and prejudice. Evidence of this can be found, Plaintiffs claim, in the fact that it took the jury only ten minutes to enter its verdict following a four-day trial. In response, Defendant points to the use of these terms in various forms of legal authority to demonstrate that they have legitimate meaning in both civil and criminal contexts.
¶ 13 The term “guilty” is defined as “responsible for a crime or tort or other offense or fault.”
Blacks Law Dictionary
(6th ed.1990). It is used in the Oklahoma Statutes, the Oklahoma Uniform Jury Instructions (Civil), and the comments to describe negligent or other non-criminal but wrongful behavior.
See
Oklа. Stat. tit. 23, § 9.1 (Supp. 1995); Oklahoma Uniform Jury Instructions (Civil) Nos. 2.1, 2.2, 5.9 cmts. 5.6, 5.9 (2d ed.) In addition, opinions from this Court have utilized the phrases “guilty of negligence” or “guilty of contributory negligence.”
See, e.g., Dirickson v. Mings,
¶ 14 “Conduct of counsel ordinarily is not grounds for reversal, unless such conduct substantially influences the verdict or denies the defendant a fair trial. The cruсial question is whether counsel’s remarks resulted in actual prejudice.”
Fields v. Volkswagen of America,
III.
¶ 15 Plаintiff asserts four other errors by the trial court in admission of evidence and conduct of the trial. However each of these assertions lacks any citation of authority. “It is well settled that assignments of error unsupported by any authority will not be noticed by the Court unless it is apparent, without further research, that they are well taken.”
Peters v. Golden Oil Company,
Conclusion
¶ 16 Plaintiffs have nоt demonstrated an abuse of discretion in any of the trail court’s complained of decisions concerning admission of evidence and conduct of the trial. Therefore, these decisions will not be disturbed on appeal.
AFFIRMED.
Notes
. The object of mutual insurance is "to provide insurance protection at cost.” 1 Couch on Insurance § 1:32 (3d ed.). It “exists where several persons have joined together for their united protection, each member contributing to a fund for the payment of the losses and expenses.” Id.., at § 39:15.
. The Oklahoma State Medical Association (OSMA) is "open to physicians holding an M.D. degree who are licensed to practice medicine in Oklahoma, and who are U.S. citizens or have filed a declaration of intent to become a U.S. citizen.” OSMA has 4,600 members. Oklahoma State Medical Association (last modified 3/17/98) <http://www.osmaonline.org/$.
PLICO claims to be "a wholly owned subsidiary of OSMA and provides the only occurrence— type professional liability insurance available in Oklahoma. Over the years, aggressive action on the part of OSMA has saved Oklahoma physicians millions of dollars in insurance premiums. Coverage through PLICO is among the nation's most competitive and most stable.” Id.
