The framework and principles regarding war-caused injury or disease
22 Section 13(1) of the Act provides for the Commonwealth's liability to pay pensions in accordance with the Act where a veteran is "incapacitated from a war-caused injury or a war-caused disease".
23 Section 9(1) provides that an injury or disease suffered by a veteran shall be taken to be war-caused if:
(a) the injury suffered, or disease contracted, by the veteran resulted from an occurrence that happened while the veteran was rendering operational service;
(b) the injury suffered, or disease contracted, by the veteran arose out of, or was attributable to, any eligible war service rendered by the veteran;
…
It is uncontentious that Mr Summers' service in Vietnam together with his compassionate leave in Australia until 28 October 1968 constitutes "operational service", which is "eligible war service" under the Act. Nor is it contentious that he is a "veteran" for the purposes of the Act: see ss 5C(1), 7 and 6A-6F.
24 The causal questions in s 9(1)(a) or (b) are to be answered having regard to s 120 of the Act, as affected by s 120A. Subsections 120(1) and (3) provide:
120 Standard of proof
(1) Where a claim under Part II for a pension in respect of the incapacity from injury or disease of a veteran, or of the death of a veteran, relates to the operational service rendered by the veteran, the Commission shall determine that the injury was a war-caused injury, that the disease was a war-caused disease or that the death of the veteran was war-caused, as the case may be, unless it is satisfied, beyond reasonable doubt, that there is no sufficient ground for making that determination.
Note: This subsection is affected by section 120A.
…
(3) In applying subsection (1) or (2) in respect of the incapacity of a person from injury or disease, or in respect of the death of a person, related to service rendered by the person, the Commission shall be satisfied, beyond reasonable doubt, that there is no sufficient ground for determining:
(a) that the injury was a war-caused injury or a defence-caused injury;
(b) that the disease was a war-caused disease or a defence-caused disease; or
(c) that the death was war-caused or defence-caused;
as the case may be, if the Commission, after consideration of the whole of the material before it, is of the opinion that the material before it does not raise a reasonable hypothesis connecting the injury, disease or death with the circumstances of the particular service rendered by the person.
Note: This subsection is affection by section 120A.
…
25 Section 120(1) means that where a veteran who has rendered operational service claims a pension in respect of incapacity from injury or disease the veteran has the benefit of a reverse criminal law standard of proof in relation to whether the injury or disease is war-caused. The section does not go so far as to impose a presumption that the veteran's injury or disease is war-caused but there is no onus on a claimant to prove that it is: see s 120(6); Repatriation Commission v Deledio (1998) 83 FCR 82 ("Deledio") at 98 per Beaumont, Hill and O'Connor JJ.
26 Section 120(3) operates so that, if the material before the Commission does not raise a "reasonable hypothesis" connecting the veteran's injury or disease with the circumstances of his or her service, then the Commission shall be satisfied beyond reasonable doubt that it is not war-caused. That is, in the absence of a "reasonable hypothesis" a sufficient causal connection is deemed not to exist.
27 The reasonable hypothesis concept in s 120 was introduced by s 16 of the Repatriation Legislation Amendment Act 1985 (Cth) and then substantially re-enacted in the Act. It was brought in as a response to a perceived loosening in the criteria for successful veterans' claims following the decision in Repatriation Commission v O'Brien (1985) 155 CLR 422: see Bushell v Repatriation Commission (1992) 175 CLR 408 at 413-414 per Mason CJ, Deane and McHugh JJ.
28 In East v Repatriation Commission (1987) 16 FCR 517 at 532-533 per Jenkinson, Neaves and Wilcox JJ the Full Court explained the reasonable hypothesis concept in the following terms:
The adoption of Brennan J's notion of a reasonable hypothesis meant that Parliament was requiring something by way of a causal link, but which fell short of proof of the link - even prima facie - as a fact. The meaning of the phrase "reasonable hypothesis" was felicitously explained by a Veterans' Review Board in Stacey (unreported Nos V83/0396, V84/0821 and V28/072, 26 June 1985); words quoted by the Administrative Appeals Tribunal in Re Dell and Repatriation Commission (1986) 5 AAR 253 at 254-255:
"A hypothesis may be conveniently defined as: 'proposition made as basis for reasoning, without assumption of its truth; supposition made as starting point for further investigation from known facts; groundless assumption': The Concise Oxford Dictionary.
…
The addition of the word 'reasonable' would however seem to imply that what is required is more than a mere hypothesis. In the opinion of the Board, to be reasonable, a hypothesis must possess some degree of acceptability or credibility - it must not be obviously fanciful, impossible, incredible or not tenable or too remote or too tenuous. For a reasonable hypothesis to be 'raised' by material before the Board, we think it must find some support in that material - that is, the material must point to, and not merely leave open, a hypothesis as a reasonable hypothesis. At the same time, however, a hypothesis may be reasonable without having been proved (either on the balance of probability or beyond reasonable doubt) to be correct as a matter of fact. Were it otherwise, it would no longer be a hypothesis but would have been elevated to some higher status."
We agree with this analysis. A reasonable hypothesis requires more than a possibility, not fanciful or unreal, consistent with the known facts. It is an hypothesis pointed to by the facts, even though not proved upon the balance of probabilities. (Emphasis added)
29 In 1994 another amendment to the Act introduced s 120A which brought in the use of Statements of Principles drafted by expert medical bodies in respect of particular medical conditions so as to regulate the soundness of the medical and scientific basis of a veteran's asserted hypothesis. It relevantly provides:
120A Reasonableness of hypothesis to be assessed by reference to Statement of Principles
…
(3) For the purposes of subsection 120(3), a hypothesis connecting an injury suffered by a person, a disease contracted by a person or the death of a person with the circumstances of any particular service rendered by the person is reasonable only if there is in force:
(a) a Statement of Principles determined under subsection 196B(2) or (11); or
(b) a determination of the Commission under subsection 180A(2);
that upholds the hypothesis.
…
It provides that a hypothesis connecting an injury or disease with a veteran's service is only "reasonable" if it fits with or is consistent with, the applicable SoP.
30 The introduction of s 120A did not otherwise alter the reasonable hypothesis concept. We respectfully agree with Heerey J's explanation in Deledio v Repatriation Commission (1997) 47 ALD 261 at 273-275 ("Deledio v Repatriation Commission") at first instance, approved by the Full Court, where his Honour said:
…the 1994 amendments left intact the twin pillars of (i) the reverse onus of proof beyond reasonable doubt and (ii) the reasonable hypothesis. Accordingly, the new regime of SoPs has to be given an operation consistent with s 120(1) and 120(3) as expounded by the High Court in Bushell and Byrnes.
…
…it is necessary to repeat that the SoP has no function in relation to the proof or disproof (under s 120(1)) of the particular facts of a veteran's case. The SoPs function is limited to prescribing a medical-scientific standard with which a hypothesis must be consistent - so that the SoP can "uphold" the hypothesis. In the words of the minister (Hansard, 9 June 1994, at 1808) the SoPs were intended to "provide the template within which the individual claims will be determined". Put another way, the SoP is a subset of proved (Bushell at 414) or known (Byrnes at 571) scientific fact. Where an SoP is applicable, it is a statute-backed declaration of what is proved or known scientific fact.
… The particular claim then has to fit the template laid down in the SoP. The Byrnes methodology is applied. Do the facts raised by the claimant give rise to a reasonable hypothesis? Proof of facts is not in issue at this point. The hypothesis will not be reasonable if it is:
(i) contrary to proved or known scientific facts;
(ii) obviously fanciful, impossible, incredible, absurd, ridiculous, not tenable, too remote or too tenuous; or
(iii) (since 1994) inconsistent with (not upheld by) an applicable SoP.
(Emphasis added)
31 The rationale for this approach is clear. The Act has long given special recognition to the risk of injury or death to which service men and women are exposed and it contains provisions for the resolution of claims which are unusually favourable to veterans. Section 120(1) is such a provision, as it provides not only that a veteran's claim that he or she suffers from a war-caused injury or disease be disproved by the Commission but that it be disproved beyond reasonable doubt. In a claim of war-caused incapacity the stage at which fact finding is to occur may therefore become of central importance. As Wilcox J observed in Dixon v Repatriation Commission (1999) 59 ALD 315; [1999] FCA 582 at [25]:
…If belief is addressed at the step 3 stage [of the Deledio process], there is a risk that the decision maker will rule against a claimant simply because he or she is not persuaded the claimant's story is probably true… This would defeat the protection for veterans embodied in s 120(1), whereby a claim which fits within the factors in the relevant Statement of Principles must be accepted unless the decision maker is satisfied, beyond reasonable doubt, that it is without justification.
(Emphasis in original)
32 In Deledio at 97-98 the Full Court described a four step process for making a decision under s 120 regarding whether a veteran's injury or disease is war-caused pursuant to the Act ("the Deledio process"). Apart from one qualification (which is not relevant in the case before us) this four step process has been applied in numerous single judge and appellate decisions. The Court said:
(1) The Tribunal must consider all the material which is before it and determine whether that material points to a hypothesis connecting the injury, disease or death with the circumstances of the particular service rendered by the person. No question of fact finding arises at this stage. If no such hypothesis arises, the application must fail.
(2) If the material does raise such a hypothesis, the Tribunal must then ascertain whether there is in force an SoP determined by the Authority under s 196B(2) or (11). If no such SoP is in force, the hypothesis will be taken not to be reasonable and, in consequence, the application must fail.
(3) If an SoP is in force, the Tribunal must then form the opinion whether the hypothesis raised is a reasonable one. It will do so if the hypothesis fits, that is to say, is consistent with the "template" to be found in the SoP. The hypothesis raised before it must thus contain one or more of the factors which the Authority has determined to be the minimum which must exist, and be related to the person's service (as required by ss 196B(2)(d) and (e)). If the hypothesis does contain these factors, it could neither be said to be contrary to proved or known scientific facts, nor otherwise fanciful. If the hypothesis fails to fit within the template, it will be deemed not to be "reasonable" and the claim will fail.
(4) The Tribunal must then proceed to consider under s 120(1) whether it is satisfied beyond reasonable doubt that the death was not war-caused, or in the case of a claim for incapacity, that the incapacity did not arise from a war-caused injury. If not so satisfied, the claim must succeed. If the Tribunal is so satisfied, the claim must fail. It is only at this stage of the process that the Tribunal will be required to find facts from the material before it. In doing so, no question of onus of proof or the application of any presumption will be involved. (Emphasis added)
33 In construing the Act it is necessary to keep in mind that it is intended to operate beneficially for veterans: see Deledio v Repatriation Commission at 262-263; Repatriation Commission v Richmond [2014] FCAFC 124 ("Richmond") at [92] per Middleton, Murphy and Rangiah JJ.