In this appeal the Appellant, Swift Transportation, raises ten issues based on various rulings by the district court leading up to and during the course of a jury trial in which Swift was found liable on claims brought by the Appellees, Terry and Donna Frederick. Swift argues these rulings, individually and considered together, resulted in an unfair trial; and we should grant a new trial as to both liability and damages. The Fredericks, in turn, cross-appeal the district court’s denial of their motion for prejudgment interest. 1
On the morning of March 16, 2006, a Yellow Freight tractor-trailer collided with a Swift Transportation tractor-trailer as the Swift tractor-trailer was attempting to enter a rest stop off of U.S. Highway 54 in New Mexico. Terry Frederick, who was in the sleeping berth of the Yellow Freight tractor-trailer at the time of the accident, and his wife, Donna, subsequently brought this action against Swift for the injuries he sustained. 2 Following a trial on the merits, the jury returned a verdict in favor of *1079 the Fredericks for a total of $23,500,000. After a reduction for comparative fault, the court entered judgment against Swift in the amount of $15,275,000. On apрeal, Swift challenges the court’s rulings on several jury instructions, as well as the court’s rulings on the admissibility of certain witness testimony and evidence. The Fredericks, in their cross-appeal, argue the court’s denial of prejudgment interest was contrary to the evidence and New Mexico law. We address each issue in turn. 3
Jury Instructions
We “review a district court’s decision to give a particular jury instruction for abuse of discretion.”
United States v. Platte,
A. Course and scope of employment
At the close of the Fredericks’ evidence, the court ruled as a matter of law that Swift’s driver, who tested positive for methamphetamine on a drug test several hours aftеr the accident, acted within the scope and course of employment. The court then instructed the jury that “Swift is liable for any negligence of [its driver].” (Appellant’s App. at 2014.) On appeal, Swift argues the court erred in giving this instruction because whether its driver consumed methamphetamine before or after the accident is a disputed fact; thus, the jury could have found that the driver ingested the methamphetamine before the accident and that this action removed her from the course and scope of her employment.
In New Mexico, “whether an employee was acting within the scope of his employment is [generally] a question of fact for the jury.”
Ovecka v. Burlington N. S.F. Ry.,
[a]n act of an employee is within the scope of employment if:
1. It was something fairly and naturally incidental to the employer’s business assigned to the employee, and
2. It was done while the employee was engaged in the employer’s business with the view of furthering the employer’s interest and did not arise entirely from some external, independent and personal motive on the part of the employee.
UJI 13-407 NMRA. While this rule seems simple, “because of the ever-varying facts of each particular case,” it must nevertheless be applied variably,
Tinley v. Davis,
The undisputed facts in this case show that Swift’s driver was specifically employed to drive Swift’s tractor-trailer and, at the time of the accident, Swift’s driver was on duty, driving on her assigned route under Swift’s direction, and attempting to meet the deadline Swift established for the delivery of goods. While it is true that the exact time Swift’s driver ingested narcotics — if she did in reality ingest them — is disputed, this fact is immaterial. Driving a tractor-trailer while under the influence of methamphetamine is a negligent act, “but this does not mean that [the] negligent act [was] outside the scope of [the driver’s] employment.”
Nichols v. United States,
B. Negligence per se under the Federal Safety Regulations
At trial the court instructed the jury that if it found Swift’s driver violated any one of several Federal Motor Carrier Safety Regulations, including FMCSR §§ 382.213(a), 382.501(a), or 392.4(a), “then [the driver’s] conduct constitutes negligence as a matter of law.” (Appellant’s App. at 2021.) Swift argues this instruction was given in error because these regulations only apply to “drivers” and not “employers”; as such, Swift argues, a driver’s violation is not a proper basis for holding the employer liable. However, as the trial court noted in its order denying Swift’s motion fоr a new trial, this argument “conveniently overlooks that the court found as a matter of law that [Swift’s driver] was its employee and acting within the course and scope of her employment when the accident occurred.” (Appellant’s App. at 4465.) Under the doctrine of respondeat superior, Swift is liable for all the negligent behavior of its employee, which includes violations of the Federal Motor Carrier Safety Regulations. The court committed no error in providing this instruction.
C. Claims for negligent hiring and negligent retention
Swift claims the district court erred by instructing the jury as to its
*1081
potential liability under the theory of negligent hiring or retention after it had already found, as a matter law, that Swift was liable for its driver’s negligent acts under the doctrine of respondeat superior.
4
For support, Swift points to a .line of cases from various jurisdictions holding that “when an employer admits the applicability of respondeat superior, it is entitled to summary judgment on claims for negligent entrustment, hiring, and retention.”
Durben v. Am. Materials, Inc.,
New Mexico’s courts have expressly avoided ruling on this theory,
see Ortiz v. New Mexico State Police,
D. “Promotion” to the 026 fleet
Prior to the accident at issue, Swift’s driver was transferred to a new cross-country fleet, the 026 route. At trial the court gave the following instruction, in relevant part, regarding that transfer: “To establish negligence on the part of Swift, plaintiffs have the burden of proving at least one of the following: ... Swift failed to use ordinary care in promoting [its driver] to the transcontinental 026 fleet.” (Appellant’s App. at 2007.) Swift argues there was not substantial evidence its driver was “promoted”; rather, according to Swift, the evidence showed its driver’s reassign *1082 ment was merely a lateral move within the company. Thus, Swift argues, this instruction was both misleading аnd not supported by the evidence.
The record indicates this new assignment was more difficult, involved important clients, and would result in more pay for Swift’s driver. Indeed, Swift’s driver manager described the 026 route as having “the best miles” and being “really a good deal for the teams.” (Appellees’ Supplemental App. at 172.) Given this evidence, we cannot say the district court abused its discretion when it provided this instruction. As the court stated, the Fredericks “could have used some other buzz word to describe [the driver’s] transfer to the 026 fleet, but the meaning would have been the same, i.e. [the driver] was advanced to the 026 fleet, not demoted.” (Appellant’s App. at 4466.)
Admissibility of Expert Testimony
Having addressed the jury instructions, we now turn to Swift’s contentions concerning the admissibility of certain expert testimony.
A. Admissibility of expert testimony from Dr. Sperry and Mr. Atkinson
Swift argues the trial court erred by denying its motion to exclude the testimonies of Dr. Kris Sperry (the Fredericks’ toxicology expert) and Arthur Atkinson (the Fredericks’ trucking safety expert) because their testimonies did not meet the reliability standards of Rule 702 of the Federal Rules of Evidence and
Daubert v. Merrell Dow Pharmaceuticals, Inc.,
First, as to the court’s gatekeeper function, the record shows that for both witnesses the district court considered preliminary briefing, which included legal argument as well as deposition transcripts and full copies of the experts’ reports. The court then held
Daubert
hearings where the witnesses were subjected to examination by both sides, and, as concerned Dr. Sperry, the court considered additional briefing following the hearing. Finally, the court issued detailed opinions as to each witness containing “specific findings on the record,”
Dodge,
B. Partial exclusion of Robert Reed’s testimony and proffer of evidence
Prior to the trial, the district court granted, in part, the Fredericks’ motion to strike the proposed expert testimony of Robert Reed, Swift’s designated expert on trucking safety and regulatory compliance. Specifically, the court held that several *1083 exhibits, including a turning study conducted at the scene of the accident and a perception study showing what a driver could have seen on the night of the accident, fell within areas outside the scope of Reed’s expert designation. See Fed.R.Civ.P. 37(c)(1). During the trial, the court also refused to allow Swift to make a proffer of the excluded portions of Reed’s proposed testimony.
After reviewing the record, we hold the district court did not abuse its discretion in excluding portions of Reed’s testimony.
See Woodworker’s Supply, Inс. v. Principal Mut. Life Ins. Co.,
Additionally, the district court did not err in denying Swift’s proffer of evidence. Rule 103 of the Federal Rules of Evidence states, in part, that “[e]rror may not be predicated upon a ruling which ... excludes evidence unless a substantial right of the party is affected, and ... the substance of the evidence was made known to the court by offer.” Fеd.R.Evid. 103(a). Essentially, “the proponent must explain what it expects to show and the grounds for which the party believes the evidence to be admissible.”
Polys v. Trans-Colorado Airlines, Inc.,
Admissibility of Other Evidence
We next consider Swift’s arguments concerning several of the district court’s evidentiary rulings. We review a court’s evidentiary rulings for an abuse of discretion, according “deference to a district court’s familiarity with the details of the case and its greater experience in evidentiary matters.”
Sprint/United Mgmt. Co. v. Mendelsohn,
A. Evidence of the non-use of the sleeper berth safety restraints
At trial, the district court excluded evidence tending to show Terry Frederick was not using the safety restraints in the sleеper berth at the time of the accident. The court based this ruling on its *1084 reading of New Mexico’s Safety Belt Use Act. See N.M. Stat. Ann. § 66-7-373(A) (“Failure to be secured by a child passenger restraint device or by a safety belt as required by the Safety Belt Use Act shall not in any instance constitute fault or negligence and shall not limit or apportion damages.”). On appeal, Swift argues that because the plain language of the statute does not include tractor-trailer sleeper safety nets, the court’s ruling improperly expanded “the meaning and definition of the statute” beyond its clear and unambiguous meaning. (Appellant’s First Br. at 48.)
We are not persuaded by Swift’s argument, as we do not believe that New Mexico courts would permit the introduction of evidence regarding this particular passenger safety restraint. In
Norwest Bank New Mexico v. Chrysler Corp.,
B. Evidence of prior convictions & driving issues
At trial, the district court allowed evidence, over Swift’s objections, concerning its driver’s prior license suspensions, drug use, convictions, and failures on different portions of the necessary licensing exams. On appeal, Swift argues the district court erred becausе this evidence was either irrelevant, too prejudicial, or both. 5 After reviewing the record and the parties’ briefs, we conclude the district court did not abuse its discretion by allowing this evidence. The disputed evidence was relevant to the Fredericks’ claims, and the court gave appropriate limiting instructions to the jury concerning those pieces of evidence that were relevant only to the driver’s credibility.
Cumulative Error
Finally, Swift argues we should grant a new trial because the trial court’s rulings resulted in cumulative error. However, because the trial court committed no errors, there cannot be cumulative error.
See Moore v. Reynolds,
Denial of Prejudgment Interest
As a final issue, we must address the Fredericks’ cross-appeal, which alleges the district court erred when it denied the Fredericks’ motion for prejudgment interest. New Mexico law states that
[a] court in its discretion may allow interest of up to ten pеrcent from the date the complaint is served upon the defendant after considering, among other things:
*1085 (1) if the plaintiff was the cause of unreasonable delay in the adjudication of the plaintiffs claims; and
(2) if the defendant had previously made a reasonable and timely offer of settlement to the plaintiff.
N.M. Stat. Ann. § 56-8-4(B). However, these two factors are not exclusive and “the trial court should take into account all relevant equitable considerations that further the goals of [the statute].”
Gonzales v. Surgidev Corp.,
In denying the Fredericks’ motion for prejudgment interest, the trial court first concluded neither they nor Swift caused any unreasonable delay. The court then turned to the reasonableness of Swift’s settlement offer of $400,000 (given in response to the Fredericks’ offer of $14,000,000).
6
The court characterized the issue as “troublesome and close,” and also noted the great disparity between Swift’s settlement offer and the jury’s final award. (Appellees’ Supplemental App. at 285.) However, the court disregarded this disparity, noting that “there is no case law stating that [the final jury award] is an appropriate way to judge whether pre-trial offers are reasonable.” (Appellees’ Supplemental App. at 286.) The court then found Swift’s offer was not unreasonable based on Swift’s good-faith denial, throughout the proceedings, of its own negligence and its liability for its driver’s actions. Lastly, the court concluded an award of prejudgment interest would not serve the purposes of section 56-8-4(B). We generally review the denial of an award of prejudgment interest for an abuse of discretion.
See Atl. Richfield Co. v. Farm Credit Bank of Wichita,
On appeal, the Fredericks argue the district court abused its discretion when it failed to consider the disparity between Swift’s settlement offer and the jury’s final award.
See Koon v. United States,
We are not convinced that
Lucero
stаnds for the proposition that a court should consider the disparity between a settlement offer and the final jury award when considering the imposition of prejudgment interest, and we also note that no other court has adopted the Fredericks’ proposed view. Rather, we read
Lucero,
as did the New Mexico Supreme Court in a subsequent case, to stand for the proposition that a court’s reasons for granting or denying prejudgment interest may, in some cases, be inferred from the record.
*1086
See Gonzales,
A “trial court should take into account all relevant equitable considerations that further the goals of [the statute].”
Id.
Although the court did not consider the difference between the first settlement offer and the final judgment, the court did consider the equities of an award of prejudgment interest. We agree with its judgment that the purposes of section 56-8-4(B) would not be served by an award оf prejudgment interest in this case.
See Weidler v. Big J Enters., Inc.,
For the foregoing reasons we AFFIRM the district court’s rulings on all issues raised by Swift, as well as the court’s ruling on the issue of prejudgment interest.
Notes
. Swift has filed a motion to strike portions of the Fredericks’ reply brief, which concerns the cross-appeal, or, alternatively, for leave to file a sur-reply brief. Essentially, Swift argues the Fredericks' reply brief, which contains a longer discussion of the basis for their cross-appeal than was contained in their principal and response brief, raises new arguments that Swift has not had a chance to address. After considering the parties’ arguments, we fail to see any merit in Swift’s assertions. Although the Fredericks' reply brief contains more detailed arguments than are contained in their principal and response brief, each argument was addressed in the principal and response brief alongside arguments addressing the ten issues Swift has raised on appeal. Accordingly, Swift’s motion is DENIED.
. The Fredericks also initially included the driver of the Swift tractor-trailer in the lawsuit, but she was later dismissed.
. In their brief, the Fredericks allege Swift has waived its right to appeal several issues. After careful review of the record, we conclude Swift properly preserved each of the ten issues it raises on appeal.
. Swift has also alleged there is insufficient evidence to support an instruction for either negligent hiring or retention; however, after reviewing the record we conclude there was sufficient evidence in the recоrd to support the Fredericks’ claims. Although the Fredericks’ expert did not testify Swift's employment practices violated any specific federal regulations, his testimony was sufficient to show, consistent with New Mexico law, Swift's employment practices may have violated its "common law duty to members of the public whom [Swift] might reasonably anticipate would be placed in a position of risk of injury as a result of the [employment].’’
Lessard v. Coronado Paint & Decorating Ctr., Inc.,
. Swift has also argued that evidence of its driver's prior convictions was impropеr under Rule 609(b) of the Federal Rules of Evidence because the convictions were more than 10 years old. However, the district court allowed evidence of these convictions because it determined that "the probative value of the conviction supported by specific facts and circumstances substantially outweigh[ed] its prejudicial effect.” Fed.R.Evid. 609(b). We see no abuse of discretion in this ruling.
. It should be noted that at a later mediation Swift raised its settlement offer to $560,000 in response to the Fredericks' decreased settlement offer of $13,850,00.
