OPINION
¶ 1 In this stаtutory special action, petitioner/employee Jaroslav Hypl challenges the admimstrative law judge’s (ALJ) decision concluding that Hypl had failed to show that Ms Mjury occurred in the course of and arose out of Ms employment with Corexpress. The ALJ made this determination based, in part, on Ms conclusion that Hypl was not entitled to the benefit of a presumption. Becausе we conclude that Hypl may be entitled to a presumption if he can show Ms injuries occurred during the time and space limitations of Ms employment, we set aside the award.
¶ 2 The facts relevant to tMs special action are undisputed. On May 2, 2002, Hypl accepted a job with Corexpress to transport several barrels of wire from Nogales, Arizona, to El Paso, Texas, a distance of approximately 350 miles. Hypl began the trip at approximately 6:00 p.m. that evening and was instructed to deliver the wire by 6:00 a.m. the next morning. At 6:30 a.m., a half hour past the required delivery time, Hypl was arrested on Interstate 10 near Deming, New Mexico, after a police officer witnessed him driving erratically. At the time of Ms arrest, Hypl was traveling westbound, i.e., away from El Paso, but had not yet delivered the wire to its destination.
¶3 Presuming Hypl was intoxicated, the officer took him to a police station for booking. After closer examination, the officer realized Hypl was injured and sought medical attention for Mm. Hypl was taken to a nearby hospital where physicians determined that he had a skull fracture on the top of Ms head, blood clots in the frontal and temporal lobеs of Ms brain, and blood in the surface of his brain. He was transported by helicopter to University Medical Center in Tucson, Arizona, for emergency surgery and remained in a coma for over eight hours after the surgery.
¶4 Hypl filed a claim for workers’ compensation benefits, which was demed. Hypl requested a hearing and testified at the hearing that he had no memory of the events that had caused his injury. Although he remembered loading the wire onto the truck in Nogales and driving toward Interstate 10, he recalled nothing else until he awoke from the coma after Ms surgery. The ALJ determined that Hypl had not met Ms burden of proving the injury had occurred within the course and scope of Ms employment. The ALJ further concluded that the “unexplained death presumption” had not been extended in Arizonа to an applicant who was alive and declined to extend it in tMs case. Ultimately, the ALJ found the injury noncompensable. The award was affirmed upon admimstrative review, and this statutory special action followed.
¶5 Hypl argues on review that the ALJ’s award is not reasonably supported by the evidence, claiming he was entitled to a presumption that the injury occurred within the course and scope of Ms employment. On review of an award, we deferentially review an ALJ’s factual findings reasonably supported by the record but review the ALJ’s legal conclusions de novo.
PFS v. Indus. Comm’n,
¶ 6 A compensable injury must both arise out of and occur in the course of employment. A.R.S. § 23-1021(A). The “arising out of’ requirement refers to the
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origin or cause of the injury and is met when the claimant shows a сausal relationship between the employment and the injury.
See Murphy v. Indus. Comm’n,
¶ 7 The unexplained death presumption, however, can shift the burden of producing evidence.
See Martin v. Indus. Comm’n,
“It is generally held that when it is shown that an employed was found dead at a plaсe where his duties required him to be, or where he might properly have been in the performance of his duties during the hours of his work, in the absence of evidence that he was not engaged in his master’s business, there is a presumption that the accident arose out of and in the course of the employment within the meaning of the compensation acts.”
¶ 8 The following year, in an unrelated case that coincidentally involved the same name, our supreme court considered the issue again in
Martin v. Industrial Commission,
“When an employee is found dead under circumstances indicating that death took place within the time and space limits of the employment, in the absence of any evidence of what caused the death most courts will indulge a presumption or inference that the death arose out of the employment.”
Martin,
¶ 9 In
Downes v. Industrial Commission,
There is a presumption that if an employee is injured while on company property during working hours, he is injured while within the scope and course of his employment ____
There is a further presumption that when a workm[a]n is killed on the job he was, at the time of the fatal accident, within the scope and сourse of his employment
Downes,
¶ 10 In
Bennett v. Industrial Commission,
“The occurrence of the death within the course [i.e., the time and space limits] of employment at least indicates that the employment brought deceased within range of the harm, and the cause of harm, being unknown, is neutral and not personal. The practical justification lies in the realization that, when the death itself has removed the only possible witness who could prove causal connection, fairness to the dependents suggests some softening of the rule requiring claimant to provide affirmative proof of each requisite element of com-pensability.”
Id.
at 536,
¶ 11 Finally, in
Konichek v. Industrial Commission,
The presumption operates to relax a claimant’s burden to prove that death occurred in the course of employment. Larson explains the rule as follows:
“When an employee is found dead under circumstances indicating that death took place within the time and space limits of the employment, in the absence of any evidence of what caused the death, most courts will indulge a presumption or inference that the death arose out of the employment.”
Id.
at 298,
¶ 12 Larson has recognized the difficulty that occurs when doubt exists on whether the employee was in the course of employment at the time of death. After stating that the death presumption applies to the arising out of requirement in the absence of proof of a cause of death, Larson acknowledges that applying the presumption to that requirement “becomes less clear when there is some room for doubt whether the injury even took place in the course of employment.” 1 Arthur Larson & Lex K Larson, Larson’s Workers’ Compensation Law § 7.04(2)(c), at 7-29 (2004). Larson further states: “When ... the evidence leaves a wide area of uncer *386 tainty about the decedent’s movements between the last time he or she was seen and the discovery of his or her death, denials have been issued because of the failure to bring the episode within the course of employment in the first place.” Larson & Larson, su pra, § 7.04(2)(e), at 7-30. Larson then cites cases in which sufficient connection to employment has been found and cases in which such a connection has not been found.. In each case, at least cirсumstantial evidence of relation to the course of employment was required in order to invoke the presumption. Larson & Larson, supra, § 7.04(2)(c), at 7-30 to 7-35.
¶ 13 Based on the case law, we conclude that the unexplained death presumption softens both the in the course of employment element and the arising out of employment element. Therefore, in the absence of any contrary evidеnce, if a claimant proves by a preponderance of the evidence that the decedent was within the time and space limitations of employment when injured, we presume that the injury occurred in the course of employment, ie., the employee was injured while doing the employer’s work and not while on a personal deviation, and that the unexplained injury arosе out of the employment.
¶ 14 In this case, the ALJ correctly noted that the death presumption has never been applied in Arizona to a living claimant. But this presumption developed out of fairness to claimants “when the death itself has removed the only possible witness who could prove causal connection.” Larson & Larson, supra, § 7.04(2), at 7-22. Hypl’s injury has left him unable to remember anything about how hе was injured and, thus, has effectively removed the only possible witness who could prove his injury was causally related to his employment. We must therefore determine whether the unexplained death presumption, or a similar type of presumption, should apply in the case of a living claimant who, by reason of the injury, is unable to testify about how he or she was injured.
¶ 15 First, we note that, in
Downes,
the supreme court stаted: “There is a presumption that if an employee is injured while on company property during working hours, he is injured while within the scope and course of his employment.”
¶ 16 Although this issue is one of first impression in Arizona, other states have considered similar issues with differing results. One state has applied this presumption in cases comparable to the present one in which the claimant is comatose or otherwise unable to explain the injury.
See Sena v. Cont’l Cas. Co.,
¶ 17 Lаrson suggests that the same rationale that supports the death presumption would support applying a similar presumption to an injured employee who is unable to relate the circumstances of the injury. Larson notes: “[I]t could be argued that, when the claimants’ inability to tell the story is destroyed, not by death, but by its (for this purpose) equivalent in the form of total unconsciousness or inability tо communicate, the same presumption should be indulged.” Larson & Larson, supra, § 7.04(2), at 7-22.
¶ 18 In considering this issue, we note that Arizona cases have taken an expansive view of the in the course of employment and arising out of employment requirements in order to effectuate the workers’ compensation policy of construing the statutes liberally to the employee’s benefit. In Peterson
v. Industrial Commission,
¶ 19 In
Special Fund v. Catalina Trucking Co.,
¶ 20 In order to effectuate the principle that the workers’ compensation statutes shall be liberally construed in favor of payment of compensation benefits,
see Bennett,
¶ 21 In this case, the ALJ found that Hypl has no memory of the cause of or the events leading to his injury. And neither the emрloyer nor the insurer disputed below that Hypl had suffered amnesia as a result of the injury and cannot remember the events. *388 Therefore, if Hypl can provide a sufficient factual basis to allow an inference that he was injured in the time and space limitations of his employment, he is entitled to a presumption that his injury occurred in the course of and arose out of his employment.
¶ 22 The ALJ found that “the preponderance of the evidence presented does not establish [Hypl] was in the course and scope of his employment or that the ‘injury’ arose out of the employment.” But the ALJ then stated: “Therefore], [Hypl] has not met his burden and the claim must be found noncompensable unless there is a presumption in favor of [Hypl] in view of his lack of memory that would soften the requirement of affirmative proof of an injury arising out of and in the course and scope of his employment.” We have now adopted that presumption. And, although the ALJ made findings of fact that could indicate he found Hypl had failed to satisfy the time and space limitations necessary to invoke the presumption, neither the exact requirements to invoke the presumption nor the presumption had been defined previously. Accordingly, we cannot say that the ALJ had them in mind when making his findings. Therefore, we set aside the award.
