OPALA, Justice.
¶ 1 The single issue on certiorari is whether the three-judge panel’s [panel] decision that claimant’s injury did not arise out of and in the course of his employment stands supported by competent evidence. We answer in the affirmative.
I
THE ANATOMY OF LITIGATION
¶ 2 David Lanman [Lanman or claimant] was employed as a
reserve officer
for the Oklahoma County Sheriffs Office [sheriff or employer]. He was assigned to a position of “outside rover.” His duties consisted primarily of (a)
patrolling
the outer perimeter of the county jail to prevent escapes, (b)
providing
security for the jail, county courthouse building, employee parking lot and surrounding areas and (c)
transporting
prisoners between jails and to obtain medical services.
. ¶ 3 On July 22, 1995 Lanman arrived at work at 6:00 p.m. for a thirteemhour shift. He was in uniform, armed, and in a marked patrol car. The car was equipped with one radio frequency, which allowed him to call and hear only those calls that were transmitted by the sheriffs dispatcher. Around 11:00 p.m., Lanman was in his patrol car
en route
to dinner when he heard
on his personal police scanner
a radio transmission from an Oklahoma City Police Department [OCPD] officer. The transmitting officer was advising the OCPD dispatcher that he had heard gunshots and was .going to check out the area, which was approximately eight blocks from claimant’s location. In a second transmission, the same officer stated that he was “out on two subjects.” Without notifying the sheriffs - dispatcher, claimant proceeded to the transmitting officer’s location to provide backup. Before arriving at the scene, claimant broadsided a vehicle that crossed into his path.
¶ 4 Lanman, who received injuries in the accident, brought this compensation claim. Employer maintained that Lanman’s injury did not “arise out of’ and “in the course of’ his employment. The trial judge agreed and denied the claim.
The order was affirmed on claimant’s appeal to a three-judge panel. Vacating the panel’s decision, the Court of Civil Appeals [COCA] held that
the order was not supported by competent evidence.
The claim was remanded with directions to award benefits. COCA’s disposition rests on public-policy grounds. The court
reasoned
(a) the claimant
qua
sheriffs officer had a statutory duty “to preserve and enforce public peace;”
(b) it was reasonable for claim
ant to conclude that an emergency situation had arisen which required his immediate intervention; and (e) in attempting to provide backup assistance to the OCPD officer, claimant was carrying out the duties that a sheriffs officer would ordinarily perform in an emergency.
¶ 5 On certiorari granted upon the employer’s petition, we
vacate today COCA’s opinion and, sustain the panel’s order.
II
THE STANDARD OF REVIEW
¶ 6 Whether an employee’s injury
arises out of or occurs in the course of
employment presents an issue of fact to be determined by the trial judge.
Where there is no conflict in the evidence (and no opposite inferences may be drawn from undisputed proof),
the question is one of law.
The trial judge’s non-jurisdictional findings may not be disturbed on review if supported by competent proof.
Evidence in the record, on the basis of which the trier could have reached a contrary conclusion, has no legal impact upon the review process that tests a workers’ compensation court’s findings.
It is only the absence of competent evidence
that makes the tribunal’s decision erroneous (as a matter of law) and hence subject to appellate vacation.
-
Ill
¶ 7 COMPENSATION LAW’S
“ARISING-OUT-OF
AND
IN-THE-COURSE-OF
EMPLOYMENT” DICHOTOMY
¶ 8 A compensable work-related injury must both arise out of
and occur in the course of
the worker’s employment.
The two clauses “arise out of’ and “in the course of’ are not interchangeable.
The
Arising-Out-Of
Prong
¶ 9 The
arising-out-of
prong contemplates a causal relationship between the act engaged in at the time injury occurs and the requirements of employment.
It calls for an assessment of the interplay of risks to determine if the injury for which compensation is sought has the requisite connection to the job.
Oklahoma jurisprudence recognizes three categories of risk associated with injuries claimed to be compensable:
(1) those so uniquely associated with employment that they may be regarded as distinctly
employment
related;
(2) those
purely personal
to the worker;
and (3) those that are neutral.
An intermixture of employment-related hazards with those that are strangers to the work milieu might be regarded as a fourth category.
The
In-The-Course-Of
Prong
¶ 10 The
in-the-course-of
prong, which relates to the time, place or circumstances under which the injury is sustained,
tests whether, at the critical moment, claimant was on a mission for the employer.
An employee is deemed to have deviated from the course of employment when that individual embarks on a purely personal errand or
one that takes the worker beyond the assigned perimeter of the claimant’s mission for the employer.
Only the second prong— that of
in the course of
employment— is implicated by the record on review.
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OPALA, Justice.
¶ 1 The single issue on certiorari is whether the three-judge panel’s [panel] decision that claimant’s injury did not arise out of and in the course of his employment stands supported by competent evidence. We answer in the affirmative.
I
THE ANATOMY OF LITIGATION
¶ 2 David Lanman [Lanman or claimant] was employed as a
reserve officer
for the Oklahoma County Sheriffs Office [sheriff or employer]. He was assigned to a position of “outside rover.” His duties consisted primarily of (a)
patrolling
the outer perimeter of the county jail to prevent escapes, (b)
providing
security for the jail, county courthouse building, employee parking lot and surrounding areas and (c)
transporting
prisoners between jails and to obtain medical services.
. ¶ 3 On July 22, 1995 Lanman arrived at work at 6:00 p.m. for a thirteemhour shift. He was in uniform, armed, and in a marked patrol car. The car was equipped with one radio frequency, which allowed him to call and hear only those calls that were transmitted by the sheriffs dispatcher. Around 11:00 p.m., Lanman was in his patrol car
en route
to dinner when he heard
on his personal police scanner
a radio transmission from an Oklahoma City Police Department [OCPD] officer. The transmitting officer was advising the OCPD dispatcher that he had heard gunshots and was .going to check out the area, which was approximately eight blocks from claimant’s location. In a second transmission, the same officer stated that he was “out on two subjects.” Without notifying the sheriffs - dispatcher, claimant proceeded to the transmitting officer’s location to provide backup. Before arriving at the scene, claimant broadsided a vehicle that crossed into his path.
¶ 4 Lanman, who received injuries in the accident, brought this compensation claim. Employer maintained that Lanman’s injury did not “arise out of’ and “in the course of’ his employment. The trial judge agreed and denied the claim.
The order was affirmed on claimant’s appeal to a three-judge panel. Vacating the panel’s decision, the Court of Civil Appeals [COCA] held that
the order was not supported by competent evidence.
The claim was remanded with directions to award benefits. COCA’s disposition rests on public-policy grounds. The court
reasoned
(a) the claimant
qua
sheriffs officer had a statutory duty “to preserve and enforce public peace;”
(b) it was reasonable for claim
ant to conclude that an emergency situation had arisen which required his immediate intervention; and (e) in attempting to provide backup assistance to the OCPD officer, claimant was carrying out the duties that a sheriffs officer would ordinarily perform in an emergency.
¶ 5 On certiorari granted upon the employer’s petition, we
vacate today COCA’s opinion and, sustain the panel’s order.
II
THE STANDARD OF REVIEW
¶ 6 Whether an employee’s injury
arises out of or occurs in the course of
employment presents an issue of fact to be determined by the trial judge.
Where there is no conflict in the evidence (and no opposite inferences may be drawn from undisputed proof),
the question is one of law.
The trial judge’s non-jurisdictional findings may not be disturbed on review if supported by competent proof.
Evidence in the record, on the basis of which the trier could have reached a contrary conclusion, has no legal impact upon the review process that tests a workers’ compensation court’s findings.
It is only the absence of competent evidence
that makes the tribunal’s decision erroneous (as a matter of law) and hence subject to appellate vacation.
-
Ill
¶ 7 COMPENSATION LAW’S
“ARISING-OUT-OF
AND
IN-THE-COURSE-OF
EMPLOYMENT” DICHOTOMY
¶ 8 A compensable work-related injury must both arise out of
and occur in the course of
the worker’s employment.
The two clauses “arise out of’ and “in the course of’ are not interchangeable.
The
Arising-Out-Of
Prong
¶ 9 The
arising-out-of
prong contemplates a causal relationship between the act engaged in at the time injury occurs and the requirements of employment.
It calls for an assessment of the interplay of risks to determine if the injury for which compensation is sought has the requisite connection to the job.
Oklahoma jurisprudence recognizes three categories of risk associated with injuries claimed to be compensable:
(1) those so uniquely associated with employment that they may be regarded as distinctly
employment
related;
(2) those
purely personal
to the worker;
and (3) those that are neutral.
An intermixture of employment-related hazards with those that are strangers to the work milieu might be regarded as a fourth category.
The
In-The-Course-Of
Prong
¶ 10 The
in-the-course-of
prong, which relates to the time, place or circumstances under which the injury is sustained,
tests whether, at the critical moment, claimant was on a mission for the employer.
An employee is deemed to have deviated from the course of employment when that individual embarks on a purely personal errand or
one that takes the worker beyond the assigned perimeter of the claimant’s mission for the employer.
Only the second prong— that of
in the course of
employment— is implicated by the record on review. Nobody questions that had the claimant’s pursuit of the shooting incident been within his mission for the employer, the traffic accident that ensued could be considered an employment-related risk.
¶ 11 Although the panel’s order does not state whether its denial rests either on the
arising-out-of
prong or solely on the
in-the-course-of
prong, we need not remand this cause for a more specific finding.
This is so because the
only issue formed by the evidence dealt neither with the accidental character of the injury nor with the injury’s relation to the risk of on-the-job hazards, but solely with whether the servant, at the critical time and place, was outside the scope of his employment. Implicit in the denial is that the tribunal found the servant had left that mission.
IV
¶ 12 THE RECORD SUPPORTS THE PANEL’S FINDING THAT CLAIMANT’S INJURIES WERE NOT SUSTAINED
IN THE COURSE OF
HIS EMPLOYMENT
The Employer’s Theory
¶ 13 According to employer, Lan-man was on a personal mission at the time that his injuries were sustained. As a reserve officer, he had received minimal law enforcement instruction. He was not trained to respond to emergency calls.
Lanman’s vehicle had no overhead lights, sirens or emergency equipment. The car’s radio had but a single channel from the car to the sheriffs dispatcher. The OCPD calls could not be heard from that radio. The regularly used radio and emergency equipment had been removed from the outside rover cars to prevent these car drivers from responding to calls beamed by sources other than the sheriffs dispatcher. Lanman was listening to his
personal police scanner
when he heard the police officer’s first report to the OCPD dispatch.
The officer requested no backup before leaving his vehicle to investigate the gunshots heard in the area. According to the employer, Lanman had willfully violated
the sheriffs policy and procedure. Two months before the incident Lanman had been instructed (a) not to provide backup service for any OCPD calls unless he was specifically dispatched and (b) to call in his location and destination before taking any kind of action outside the perimeter of the county jail or of the county courthouse building. Claimant left the assigned area without reporting by radio to the sheriffs dispatcher either his location or plans. He was about eight blocks away from his assigned post — traveling over the posted speed limit — when, after failing to yield or slow down at a stop sign before entering the intersection, his vehicle broadsided another car.
The Claimant’s Theory
¶ 14 Lanman argues that a uniformed reserve deputy sheriff has a statutory duty to “preserve and enforce public peace,” citing 22 O.S.1991 § 37.
According to Lanman, about a year before the accident, the chief of the reserve division had advised him orally that whenever he was in uniform and driving a marked police unit, he must judge each situation for himself.
He had received no written policies or procedures describing his duties as an outside rover. In order to fulfill his duty as a uniformed officer, Lanman urges, he was required to respond whenever an emergency situation should arise.' When he attempted to provide backup, • Lanman acted on the belief that an OCPD officer’s life might be in danger. The possibility that he could be involved in an accident while driving the patrol ear, Lanman submits, is plainly an employment-related risk causally connected to the injury he sustained.
. ¶ 15 Although claimant insists the facts are undisputed, the record reveals a sharp disagreement over the scope of a reserve officer’s duties. If Lanman’s proof is accepted as credible, he had the discretion to respond to any situation he believed to be an emergency and to leave his assigned post without first clearing that action with the dispatcher. On the other hand, if the sheriffs evidence is believed, the claimant’s action demonstrates what is known in agency law as a detour or deviation from the course of employment.
According to the sheriffs proof, a reserve officer assigned as an
“outside rover”
is restricted to providing security for the jail and for the surrounding county buildings and has no discretion to deviate from those duties without clearance from the sheriffs dispatcher. These restrictions, we are told, are necessary because an outside rover is not trained to respond to emergency situations nor does the vehicle assigned to that duty have the requisite equipment. When patrolling the county jail as an outside rover, this uniformed reserve officer — the claimant in this case — cannot hence be deemed to have been on a mission for the employer at the critical time in question because he collided with another car while speeding toward a shooting scene for an investigation that had not been cleared by the dispatcher.
¶ 16 Even if we assumed that the evidence was uncontroverted, the record, taken as a whole, indicates the presence of two equally reasonable but conflicting (or inconsistent) inferences that may be drawn. The tribunal chose one of the two that were available.
This court cannot impose on the trial
tribunal its own choices when two or more theories stand supported by competent evidence or when the facts stand disputed. It is for the trier to decide which theory is more cogently proved by the record. Competent proof supports the tribunal’s finding that, at the critical time and place, claimant was not performing the duties of his employment. That decision is not vulnerable to appellate vacation.
SUMMARY
¶ 17 The employer’s responsibility for compensation is governed by the policy provided in the Workers’ Compensation Act. For settlement of liability under the Act we must look to the prerequisites of that enactment.
On this record, competent evidence amply supports the panel’s critical determination that claimant’s injuries were not sustained in the course of his employment. We are hence powerless to disturb the panel’s order denying the claim.
¶ 18 On certiorari granted upon the respondent’s petition, the Court of Civil Appeals’ opinion is vacated and the claim’s denial by the Workers’ Compensation Court is sustained.
¶ 19 KAUGER, C.J., and HODGES, LAVENDER, SIMMS, HARGRAVE, ALMA WILSON and WATT, JJ., concur.
¶ 20 SUMMERS, V.C.J., concurs in part and dissents in part.