delivered the opinion of the court:
The plaintiff, Barbara L. Opper, and the defendant, Fred A. Brotz, signed a stipulation in which they agreed to determine liability in a personal injury case from the results of the parties’ polygraph examinations. Based on this agreement, the trial court dismissed Op-per’s complaint. Opper appeals. We affirm.
Opper filed a personal injury action against Brotz, an auctioneer, for injuries she allegedly suffered while Brotz was transporting a Hammond organ from her residence to the auction site. Opper proposed that the parties stipulate to a polygraph examination to resolve the issue of liability. Brotz agreed, and the parties chose Edward Bowers as the lie detector examiner. The test results indicated that Brotz had responded truthfully, but Opper had not.
Brotz filed a motion to enforce the stipulation. Opper objected, claiming that the polygraph examination did not conform to the agreement and, further, was unenforceable because it was contrary to public policy. Opper requested an evidentiary hearing on the validity of the test results.
The trial court dismissed Opper’s complaint with prejudice on January 24, 1995. Opper filed a motion to reconsider and vacate the order and again requested an evidentiary hearing. The trial court denied Opper’s motion, and she appeals.
I. THE STIPULATION
A
Opper alleges that the agreement is too indefinite to be enforceable. Even if a stipulation fails to specify some procedural details, it is enforceable if its material terms are clear, certain, and definite. See West v. H.P.H., Inc.,
Illinois favors voluntary settlements, and we should reject an otherwise valid stipulation only if it is fraudulent, unreasonable, or in violation of public policy. See People v. Sadaka,
B
Opper argues that even if the trial court properly enforced the settlement, the trial court should have held an evidentiary hearing to determine the suitability of the subjects for polygraph testing. She cites a statement allegedly made by Bowers, indicating that her emotional reaction to one question could have produced "apparently] deceptive responses to other questions,” and a report from a second examiner she hired, stating that Opper was not a reliable subject for polygraph examination.
In the Florida case of State v. Davis,
The Florida Appellate Court upheld the stipulation, noting that the parties had agreed to a mutually acceptable examiner. This examiner’s original opinion was conclusive, and the opinion of the second examiner was irrelevant because he had not been approved by both parties. The court affirmed the order quashing the indictment against the defendant. Davis,
In this case, as in Davis, the parties agreed to resolve the issue of liability based on the results of a single polygraph test conducted by a mutually acceptable examiner. Bowers never wavered from his initial opinion that Opper’s responses indicated deception; he never suggested that she was an unreliable test subject. The fact that a second examiner, hired by Opper, claimed that she could not be reliably tested does not alter the parties’ duties under the terms of the stipulation. See Davis,
II. PUBLIC POLICY
A
Opper also argues that the stipulation violates Illinois public policy. She contends that it was unconscionable for the trial court to enforce a settlement having no more validity than a "coin flip[ ]” or "a spiritualistic seance,” citing the dissent in People v. Starks,
Illinois courts favor voluntary settlements, and litigants are bound by them, regardless of how unwise they may seem in retrospect, unless they are grossly unfair or unconscionable. See Haisma v. Edgar,
In Starks,
Opper contends that since Illinois courts refuse to admit polygraph results at trial (People v. Gard,
B
Since Illinois public policy favors the voluntary resolution of disputes, a party must overcome two obstacles in order to vitiate a voluntary settlement agreement. First, an agreement may be set aside only by satisfying a high standard of proof, i.e., clear and convincing evidence. See Argueta v. Baltimore & Ohio Chicago Terminal R.R. Co.,
Second, the presumption of validity of a voluntary agreement is conclusive (Haisma,
In this case, Opper has not alleged any sufficient grounds to discharge her obligation under an agreement that she suggested. See Starks,
III. THE POLYGRAPH EXAMINATION
Finally, Opper argues that the polygraph examination exceeded the scope of the stipulation. Settlements are encouraged by Illinois courts and enforced whenever possible. McAllister v. Hayes,
In this case, the stipulation of the parties reflects their agreement on the selection of a polygraph examiner, the scope of the examinations, and the effect of various test results. These elements comprise the material terms of the parties’ agreement; the language used is plain and susceptible to only one meaning. See Argianas v. Chestler,
The stipulation states that the parties would be tested on Opper’s allegations of liability by a mutually acceptable examiner. The stipulation does not require the parties to draft or review the test questions or to submit to additional polygraph tests. Nor is there any indication that the parties were to be asked the same or similar questions. Nothing in the record indicates that the polygraph examiner failed to conduct the tests in accordance with professional standards or methodology. Opper’s only evidence regarding the validity of the testing procedures used is the opinion of another polygraph examiner, not approved by Brotz, stating that she was not a suitable test subject.
After carefully reviewing the polygraph reports, we conclude that both parties were tested on facts pertinent to Opper’s allegations of negligence. The questions did not improperly refer to damages or other extraneous matters; they were not so broad as to violate the general terms of the agreement. The polygraph tests performed by Bowers fell within the scope of the parties’ stipulation.
CONCLUSION
For these reasons, the judgment of the circuit court of Tazewell County is affirmed.
Affirmed.
BRESLIN, P.J., and SLATER, J., concur.
