This case requires us to explore the gatekeeper function of the district court in determining the admissibility of expert witnesses under
Daubert v. Merrell Dow Pharmaceuticals, Inc.,
Background
At the time of the incident giving rise to this case, Mr. Goebel was employed by the Railroad as a locomotive engineer. On January 5,1994, he was instructed to operate two “helper” locomotives to help push a 5,900 foot long, nine locomotive train through the Moffat Tunnel (“Tunnel”) in Colorado. The Moffat Tunnel is 6.21 miles long and runs over the continental divide. At the West Portal, the Tunnel is 9,084 feet above sea level, rises to 9,239 feet at its apex, and then drops to 9,198 feet at the East Portal. The Tunnel is equipped with an automatic ventilation system designed to clear the diesel fumes and exhaust which accumulate with the passage of each train. There are also twenty-one numbered “refuges” in the tunnel — spaces where the walls have been widened to hold barrels containing emergency breathing equipment.
Mr. Goebel’s helper units met up with the train late on the night of January 5 and were attached as the rear locomotives to assist in pushing through the Tunnel. Mr. Goebel was accompanied by Matthew Fletcher, a fireman/engineer. The train entered the Tunnel through the West Portal shortly after 1:00 a.m. on January 6, with all nine locomotives running full throttle in order to make it up the hill to the apex of the tunnel. At approximately 1:15 a.m., the train suddenly broke in half, the emergency brakes automatically applied, and the train came to a stop in the Tunnel.
Upon coming to a standstill, Mr. Goebel took a portable radio and left the cab to inspect the “helper” locomotives. The air in the tunnel was dark and smoky, but Mr. Goebel was able to determine that the locomotives were properly running in idle. He also noticed that the rear of the train had stopped near Refuge 5. Mr. Goebel went to the refuge to get the emergency breathing equipment, but was unable to get the barrel open. He returned to the locomotive cab after being outside between five to fifteen minutes. Mr. Goebel testified that by the time he returned to the locomotive he had a headache, tightness in his chest and nausea.
Meanwhile, Mr. Fletcher had been on the radio, attempting to determine the na^. ture of the problem. After a few minutes of discussion, Mr. Goebel left the cab again to get breathing equipment from the refuge. This time he managed to get the barrel open and returned to the locomotive with two Type “N” air respirators. On returning to the locomotive for the second time, Mr. Goebel said that his body was sore, his chest was tight and he was so disoriented that he could not read the instructions on the respirators. After donning the respirator, he went outside a third time in order to start one of the locomotives which had shut down. He ' then returned to the cab, the train started, and finally reached the East Portal around 2:07 a.m., almost one hour after entering the tunnel.
Both Mr. Goebel and Mr. Fletcher did not feel well enough to continue. They dropped off their helper locomotives at Rollins, Colorado and were picked up by an ambulance around 2:50 a.m. and placed on pure oxygen. They remained on oxygen until arriving at Lutheran Medical *1086 Center at 4:30 a.m. Blood tests for carbon monoxide poisoning conducted on both men around 5:07 a.m. revealed normal car-boxyhemoglobin levels. Mr. Goebel and Mr. Fletcher were released that morning and instructed to return in 24 hours for a follow-up.
Mr. Fletcher received no further treatment and returned to work. Mr. Goebel, however, continued to complain of dizziness, headache, abdominal pain, and disorientation as a result of the incident. He was referred by his personal doctor to Dr. Teitelbaum, a medical doctor specializing in toxicology, on February 8, 1994. Dr. Teitelbaum reviewed Goebel’s medical history — including the blood tests done at Lutheran Medical Center — and conducted a traditional physical examination. Based upon this examination, Dr. Teitelbaum wrote Mr. Goebel a May 24, 1994 letter explaining his findings: “My diagnosis is acute combustion products intoxication with a neuropsychological and neurological syndrome possible_” ApltApp. at 53.
When Mr. Goebel expressed concerns about his memory, Dr. Teitelbaum referred him to Dr. Frederick Kadushin, a neuropsychologist, for further testing. Dr. Kadushin determined that plaintiff had suffered cognitive deficits. This conclusion was reinforced by a speech pathologist who also confirmed that Mr. Goebel had cognitive deficits, probably from a mild brain injury. Mr. Goebel also was examined by a clinical psychologist who determined that plaintiff was suffering from severe depression and post traumatic stress disorder.
Mr. Goebel brought suit against the Railroad under the Federal Employer’s Liability Act, the Safety Appliances Act, and the Occupational Safety and Health Act, alleging that his personal injuries resulted from the Tunnel accident. 1 The district court granted summary judgment to plaintiff on the question of liability, limiting the trial to issues of causation and damages. At trial, Dr. Teitelbaum testified as to the causation of plaintiffs injuries.
I believe that the cause of Mr. Goe-bel’s injury was his exposure to a unique environment, deficient in oxygen at low barometric pressure, contaminated with pulmonary irritants, which combined with the unique physiologic setting which takes place at high altitude produced an oxygen lack syndrome, which produced swelling in his brain, called cerebral edema, which resulted in small diffuse pressure injuries which resulted in his cognitive defect.
It’s a complicated chain of events, but one which is relatively simple to explain on the basis of the fundamental physiology. All of these pieces have been looked at in separate events. In this gentleman, they occurred at the same time and produced this result.
Procedural Context
The Railroad argues that the district court improperly admitted Dr. Teitel-baum’s testimony, which it characterizes as “junk science relying solely upon the
ipse dixit
of the expert.” Aplt. Br. at 20. Defendant raised this issue on three separate occasions before the trial court. First, the Railroad brought a motion in limine seeking to exclude the testimony as unscientific and based solely upon possibilities. On the morning of trial, the district court orally denied this motion. We have no record of the district court’s decision; the court
*1087
minutes indicate that no court reporter was present at the time the motion was denied.
See
ApliApp. at 7; D. Ct. doc. 77 (noting denial of motion in limine). Second, when Dr. Teitelbaum was called during trial, defense counsel conducted voir dire and objected, “on the basis of
Dau-bert.”
Finally, the Railroad argued in a post-trial motion for judgment as a matter of law that Teitelbaum’s testimony should be stricken. This would consequently make judgment for defendant appropriate because “[t]he only evidence of a medical and scientific connection between the diesel fumes and Plaintiffs condition was the testimony of Dr. Daniel T. Teitelbaum.” ApliApp. at 179. The district court denied this motion in summary fashion. “The motion seeks to re-litigate an eviden-tiary issue concerning the qualifications of plaintiffs primary expert witness. The issue was raised by motion in limine, and the court fully considered the matter when it denied that motion.” Id. at 310.
Daubert Analysis
Daubert
changed the law of evidence by establishing a “gatekeeper” function for trial judges under Federal Rule of Evidence 702. “Faced with a proffer of expert scientific testimony, then, the trial judge must determine at the outset ... whether the expert is proposing to testify to (1) scientific knowledge that (2) will assist the trier of fact to understand or determine a fact in issue.”
Daubert,
It is within the discretion of the trial court to determine
hoiv
to perform its gatekeeping function under
Daubert. See Kumho Tire Co., Ltd. v. Carmichael,
While the district court has discretion in the
manner
in which it conducts its
Daubert
analysis, there is no discretion regarding the actual
performance
of the gatekeeper function.
See Kumho Tire,
A review of this case convinces us of the absolute necessity of district court findings on the record. There is not a single explicit statement on the record to indicaté that the district court ever conducted any form of
DaubeH
analysis whatsoever. The motion in limine was denied with no record of explanation; the objection at trial was overruled on the single statement that there was “sufficient foundation” for the testimony to go to the jury; and the post-trial motion for judgment as a matter of law was denied on the basis of the previous denial of the motion in limine. While we recognize that the trial court stated that it had “fully considered the matter when it denied [the motion in li-mine],” this single statement is insufficient as a basis for appellate review. We are unable to discern whether the court was referring to the professional credentials of the witness as opposed to assessing the reasoning and methodology relied upon by the witness. It is axiomatic that an expert, no matter how good his credentials, is not permitted to speculate.
See DePaepe v. General Motors Corp.,
Our holding recognizes that the district court need not “recite the
Dau-beH
standard as though it were some magical incantation,”
Ancho v. Pentek Corp.,
Here, the trial court did not have the benefit of
Kumho,
but was specifically alerted to the need for findings given the objections on the record. In the absence of such findings, we must conclude that the court abused its discretion in admitting such testimony.
See Velarde,
There remains the question of the appropriate remedy. Several of our recent cases have considered a trial court’s failure to make
Daubert
findings. In
Ve-larde,
we reversed and remanded for a new trial because the district court was specifically alerted to the need for such findings after
Daubert
and
Kumho
and declined to make them. See
Velarde,
Mr. Goebel asks us to hold that the admission of Dr. Teitelbaum’s testimony was harmless error.
See Kinser v. Gehl Co.,
Our remand in this case is limited. Mr. Goebel did not appeal the jury verdict as to Count I of his complaint (back injury from throwing railroad switches), and because Dr. Teitelbaum’s testimony did not relate to that claim, remand is not necessary. Moreover, the district court’s grant of partial summary judgment to Mr. Goe-bel regarding liability occurred before the decision on the Railroad’s motion in limine, and we do not disturb that ruling.
REVERSED and REMANDED for a new trial in conformity with this opinion.
Notes
. This was Count II of plaintiff’s complaint. Count I involved an injury to plaintiff's back which occurred during a railroad switch throwing incident. That claim was tried to the jury, which returned a verdict in favor of the Railroad. Mr. Goebel does not challenge that verdict, and we deal solely with Count II on appeal.
. If there is no objection to the expert testimony, the opposing party waives appellate review absent plain error.
See Marbled Murrelet v. Babbitt,
