STEVENS, Circuit Judge.
At about 5:15 A.M. on July 26, 1966, as a tractor-trailer being driven by Shirley Cole was turning off U.S. 30 into the Hi-De-Ho Truck Stop, it was hit from behind by another large unit driven by Thomas Maxwell. Both vehicles were overturned and suffered substantial damage; both drivers were injured and each claimed the other was at fault. In the litigation which ensued, the jury believed Thomas.1
Appellants contend that the jury would have believed Shirley if the court had admitted into evidence (1) the transcript of their investigator’s interview with Thomas’s father, which included comments by Thomas; and (2) the testimony of an accident reconstruction expert. We have concluded that the trial court properly rejected both offers.
Many of the facts are uncontradicted. Shirley worked as a relief driver for her husband, who owned the tractor she was driving. She had been driving a tractor-trailer for about a year or a year and a half. She was unfamiliar with U.S. 30. On the morning of the accident, with the exception of a short break at about 3:00 A.M., she had been driving steadily for about four and one-half hours when the accident occurred. Her husband had been asleep since shortly after they picked up a refrigerated trailer in Muncie, Indiana. They had been on the road quite steadily, taking alternate turns at driving and resting in the “sleeper,” for an undetermined number of days after leaving California and prior to the collision.
Thomas was on his regular run, making the turn between Fort Wayne and Chicago. He had been driving heavy units for six years. He lived in Plymouth, Indiana, only a few miles from the truck stop, and had worked there before he became a driver at age 18. On the morning of the accident his trailer was loaded at Warsaw, Indiana, only 25 or 26 miles away. He was paid by the mile rather than the hour (he testified that he was driving at 55 miles per hour, the speed limit for trucks on U.S. 30).
The witnesses agreed that Shirley had overtaken Thomas shortly before he reached the Hi-De-Ho. The conflict in the testimony related primarily to the place where she passed him and how fast they were going. According to Shirley, about three and one-half to four miles east of the Hi-De-Ho she saw Thomas’s unit which was traveling at about 45 miles per hour. She passed Thomas, driving about 55, and had returned to the right-hand lane about three-quarters of a mile before reaching the truck stop. She slowed without immediately braking, and noticed that [1218]*1218Thomas was “a good distance” behind her when she first put on her turn signals. The turn signals were on for about three-quarters of a mile. She had slowed to about six miles per hour and was completing her turn when her trailer was struck by Thomas’s cab.
Thomas testified that Shirley was only about three-quarters of a mile from the truck stop when she came up from behind; that he was doing 55 and she must have been traveling 10 or 15 miles faster; that they had almost reached the Hi-De-Ho before she returned to the right-hand lane after passing him; that she was only a few feet ahead of him when her brake lights went on; then “* * * I stomped on my pedal, my brake pedal, with both feet and pulled my hand valve, and tried to pull to the left, * * * there was an impact, and that is the last thing I remember.”
I.
The case was tried in the Federal District Court for the Northern District of Illinois. Federal jurisdiction was predicated on the diverse citizenship of the parties. See 28 U.S.C. § 1332. Although the accident occurred in Indiana, in both the trial court and in this court the parties have relied on Illinois evidence law. In their reply brief, however, appellants for the first time advanced the argument that Rule 43(a) of the Federal Rules of Civil Procedure is a “rule of admissibility, not exclusion,” and that even if the proffered evidence was properly excluded under Illinois law, it was admissible as a matter of federal law.2 We are satisfied that Rule 43(a) is applicable here.3 Under that rule, we ordinarily look first to the law of the forum state, in this case Illinois, and then to federal law.
With regard to the admissibility of the transcript of the investigator’s interview, the exercise of the trial court’s discretion is supported both by the Illinois authority cited by appellees and by our conception of proper practice in federal courts. Admissibility of the proffered expert testimony is within the sound discretion of the trial judge under both the Illinois and the federal cases. We are unwilling to assume that he would have exercised his discretion differently if the federal authorities cited to us by appellants’ new counsel had been urged below.
II.
On July 2, 1968, an investigator employed by appellants interviewed Archie Maxwell (Thomas’s father) in the presence of Thomas. Both Maxwells were employed by appellee, and the litigation had already been commenced.4 Indeed, appellants had already deposed Thomas. They gave no notice of the interview to opposing counsel, and no lawyer was present. The transcript of the inter[1219]*1219view makes it perfectly clear that the Maxwells were under the impression that the investigator was a representative of their employer.5
During the course of the interview, Archie Maxwell expressed the opinion that the connection between Thomas’s tractor and trailer was defective, and that without the defect Thomas could have avoided the accident.6 Thomas remained silent during several comments by, Archie expressing this opinion. In addition, after Archie had stated that the tractor manufacturer was responsible for the defect, Thomas explained that he had made a separate settlement with the manufacturer.7
The case was tried about a year after the statement was taken. In the interim appellants took a second deposition of Thomas and also deposed his father. The statement was not used at either deposition. A fair reading of the record indicates that its existence was not made known to the appellees in advance of trial notwithstanding the entry of a pre-trial order requiring the parties “* * * to advise each other in writing of documents to be offered in evidence at the trial on or before April 20, 1969, * * *”8
Appellants contend that the transcript of the interview was admissible for impeachment purposes and as substantive evidence. The record indicates that the trial court excluded the statement largely because he was offended by the investigator’s deception and trial counsel’s tactics. Appellants argue that such considerations are subordinate to the paramount interest of ascertaining the truth.
We shall identify only three reasons which adequately support the exercise of the trial judge’s discretion.
First, we share his unfavorable reaction to the deceptive manner in which the evidence was obtained,9 and to its subsequent nondisclosure.
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STEVENS, Circuit Judge.
At about 5:15 A.M. on July 26, 1966, as a tractor-trailer being driven by Shirley Cole was turning off U.S. 30 into the Hi-De-Ho Truck Stop, it was hit from behind by another large unit driven by Thomas Maxwell. Both vehicles were overturned and suffered substantial damage; both drivers were injured and each claimed the other was at fault. In the litigation which ensued, the jury believed Thomas.1
Appellants contend that the jury would have believed Shirley if the court had admitted into evidence (1) the transcript of their investigator’s interview with Thomas’s father, which included comments by Thomas; and (2) the testimony of an accident reconstruction expert. We have concluded that the trial court properly rejected both offers.
Many of the facts are uncontradicted. Shirley worked as a relief driver for her husband, who owned the tractor she was driving. She had been driving a tractor-trailer for about a year or a year and a half. She was unfamiliar with U.S. 30. On the morning of the accident, with the exception of a short break at about 3:00 A.M., she had been driving steadily for about four and one-half hours when the accident occurred. Her husband had been asleep since shortly after they picked up a refrigerated trailer in Muncie, Indiana. They had been on the road quite steadily, taking alternate turns at driving and resting in the “sleeper,” for an undetermined number of days after leaving California and prior to the collision.
Thomas was on his regular run, making the turn between Fort Wayne and Chicago. He had been driving heavy units for six years. He lived in Plymouth, Indiana, only a few miles from the truck stop, and had worked there before he became a driver at age 18. On the morning of the accident his trailer was loaded at Warsaw, Indiana, only 25 or 26 miles away. He was paid by the mile rather than the hour (he testified that he was driving at 55 miles per hour, the speed limit for trucks on U.S. 30).
The witnesses agreed that Shirley had overtaken Thomas shortly before he reached the Hi-De-Ho. The conflict in the testimony related primarily to the place where she passed him and how fast they were going. According to Shirley, about three and one-half to four miles east of the Hi-De-Ho she saw Thomas’s unit which was traveling at about 45 miles per hour. She passed Thomas, driving about 55, and had returned to the right-hand lane about three-quarters of a mile before reaching the truck stop. She slowed without immediately braking, and noticed that [1218]*1218Thomas was “a good distance” behind her when she first put on her turn signals. The turn signals were on for about three-quarters of a mile. She had slowed to about six miles per hour and was completing her turn when her trailer was struck by Thomas’s cab.
Thomas testified that Shirley was only about three-quarters of a mile from the truck stop when she came up from behind; that he was doing 55 and she must have been traveling 10 or 15 miles faster; that they had almost reached the Hi-De-Ho before she returned to the right-hand lane after passing him; that she was only a few feet ahead of him when her brake lights went on; then “* * * I stomped on my pedal, my brake pedal, with both feet and pulled my hand valve, and tried to pull to the left, * * * there was an impact, and that is the last thing I remember.”
I.
The case was tried in the Federal District Court for the Northern District of Illinois. Federal jurisdiction was predicated on the diverse citizenship of the parties. See 28 U.S.C. § 1332. Although the accident occurred in Indiana, in both the trial court and in this court the parties have relied on Illinois evidence law. In their reply brief, however, appellants for the first time advanced the argument that Rule 43(a) of the Federal Rules of Civil Procedure is a “rule of admissibility, not exclusion,” and that even if the proffered evidence was properly excluded under Illinois law, it was admissible as a matter of federal law.2 We are satisfied that Rule 43(a) is applicable here.3 Under that rule, we ordinarily look first to the law of the forum state, in this case Illinois, and then to federal law.
With regard to the admissibility of the transcript of the investigator’s interview, the exercise of the trial court’s discretion is supported both by the Illinois authority cited by appellees and by our conception of proper practice in federal courts. Admissibility of the proffered expert testimony is within the sound discretion of the trial judge under both the Illinois and the federal cases. We are unwilling to assume that he would have exercised his discretion differently if the federal authorities cited to us by appellants’ new counsel had been urged below.
II.
On July 2, 1968, an investigator employed by appellants interviewed Archie Maxwell (Thomas’s father) in the presence of Thomas. Both Maxwells were employed by appellee, and the litigation had already been commenced.4 Indeed, appellants had already deposed Thomas. They gave no notice of the interview to opposing counsel, and no lawyer was present. The transcript of the inter[1219]*1219view makes it perfectly clear that the Maxwells were under the impression that the investigator was a representative of their employer.5
During the course of the interview, Archie Maxwell expressed the opinion that the connection between Thomas’s tractor and trailer was defective, and that without the defect Thomas could have avoided the accident.6 Thomas remained silent during several comments by, Archie expressing this opinion. In addition, after Archie had stated that the tractor manufacturer was responsible for the defect, Thomas explained that he had made a separate settlement with the manufacturer.7
The case was tried about a year after the statement was taken. In the interim appellants took a second deposition of Thomas and also deposed his father. The statement was not used at either deposition. A fair reading of the record indicates that its existence was not made known to the appellees in advance of trial notwithstanding the entry of a pre-trial order requiring the parties “* * * to advise each other in writing of documents to be offered in evidence at the trial on or before April 20, 1969, * * *”8
Appellants contend that the transcript of the interview was admissible for impeachment purposes and as substantive evidence. The record indicates that the trial court excluded the statement largely because he was offended by the investigator’s deception and trial counsel’s tactics. Appellants argue that such considerations are subordinate to the paramount interest of ascertaining the truth.
We shall identify only three reasons which adequately support the exercise of the trial judge’s discretion.
First, we share his unfavorable reaction to the deceptive manner in which the evidence was obtained,9 and to its subsequent nondisclosure. Entirely apart from the possible probative value of the statement, the desirability of deterring improper investigative conduct was a factor which the court could properly consider in the exercise of its discretion to exclude the evidence. Cf., Elkins v. United States, 364 U.S. 206, 216-18, 80 S.Ct. 1437, 4 L.Ed.2d 1669; Bruske v. Arnold, 100 Ill.App.2d 428, 241 N.E.2d 191 (3rd Dist. 1968), af[1220]*1220firmed 44 Ill.2d 132, 254 N.E.2d 453 (1969); see also, Cataphote Corp. v. Hudson, 422 F.2d 1290, 1296 (5th Cir. 1970).10
Second, the statement did not impeach Thomas. We find no conflict whatsoever between Thomas’s direct testimony and anything said by either Archie or Thomas in the interview. On the contrary, the transcript corroborates the substance of Thomas’s testimony. While talking confidentially to a person thought to be a friend, both Thomas and Archie placed the blame on Shirley.11
Moreover, the fact that Thomas had received valuable consideration in the settlement of a possible claim against the manufacturer was collateral to his direct testimony at trial. It would have a minor effect, at best, on his credibility which was already subject to discount because of his interest in the outcome.
Third, to the extent that Archie’s self-styled expertise revealed a manufacturing defect as a possible contributing cause, appellants had ample opportunity in advance of trial to substantiate this theory with admissible evidence if in fact the theory was valid. They attempted to develop this point during cross-examination of Thomas by asking if he heard a bump immediately before the impact and thereafter impeaching his denial. This is not an appropriate way to develop a serious explanation of the cause of an accident.
Appellants’ basic argument is that the overriding importance of disclosing the truth justified their pre-trial tactics. In the long run, truth will be better served by orderly straightforward procedures than by deception and attempted surprise. We find no injustice in the fact that their stratagem misfired.12
III.
Acknowledging that the admission of expert testimony is within the sound discretion of the trial judge, appellants contend that the court erred in refusing to hear their accident reconstruction expert because (a) the court permitted appellees to elicit expert testimony from a police officer; and (b) the physical facts were beyond the ken of a lay jury.
The police officer, however, was a witness tendered by appellants. He was effectively and properly cross-examined by appellees’ counsel. The scope of that cross-examination did not, in our opinion, require the trial judge to hear testimony from another expert offered by appellants.
[1221]*1221Appellants argue that the shortcomings in the eyewitnesses’ testimony, together with the characteristics of the vehicles, their tire marks, consequences of relative speeds, and other physical facts, required explanation by a professional witness. We are satisfied that it was not an abuse of discretion for the trial judge to exclude the proffered testimony. We concur in his analysis of Illinois law13 and are satisfied as a matter of federal law that the admissibility of expert testimony is within the sound discretion of the trial judge.14 To determine where the fault lay, it was merely necessary for the jury to perform its historic function of appraising the credibility of witnesses.
The judgment is affirmed.