Applicable principles - disability discrimination
10 Section 5 of the Disability Discrimination Act, dealing with direct discrimination, provides as follows.
5 Direct disability discrimination
(1) For the purposes of this Act, a person (the discriminator) discriminates against another person (the aggrieved person) on the ground of a disability of the aggrieved person if, because of the disability, the discriminator treats, or proposes to treat, the aggrieved person less favourably than the discriminator would treat a person without the disability in circumstances that are not materially different.
(2) For the purposes of this Act, a person (the discriminator) also discriminates against another person (the aggrieved person) on the ground of a disability of the aggrieved person if:
(a) the discriminator does not make, or proposes not to make, reasonable adjustments for the person; and
(b) the failure to make the reasonable adjustments has, or would have, the effect that the aggrieved person is, because of the disability, treated less favourably than a person without the disability would be treated in circumstances that are not materially different.
(3) For the purposes of this section, circumstances are not materially different because of the fact that, because of the disability, the aggrieved person requires adjustments.
11 "Disability" is defined in s 4(1), but it is not necessary to set out the definition for present purposes.
12 The expression "reasonable adjustment", which is used in s 5(2), is defined in s 4(1) in the following way:
an adjustment to be made by a person is a reasonable adjustment unless making the adjustment would impose an unjustifiable hardship on the person.
13 The meaning of "unjustifiable hardship" is affected by s 11 of the Disability Discrimination Act, which provides:
11 Unjustifiable hardship
(1) For the purposes of this Act, in determining whether a hardship that would be imposed on a person (the first person) would be an unjustifiable hardship, all relevant circumstances of the particular case must be taken into account, including the following:
(a) the nature of the benefit or detriment likely to accrue to, or to be suffered by, any person concerned;
(b) the effect of the disability of any person concerned;
(c) the financial circumstances, and the estimated amount of expenditure required to be made, by the first person;
(d) the availability of financial and other assistance to the first person;
(e) any relevant action plans given to the Commission under section 64.
Example: One of the circumstances covered by paragraph (1)(a) is the nature of the benefit or detriment likely to accrue to, or to be suffered by, the community.
(2) For the purposes of this Act, the burden of proving that something would impose unjustifiable hardship lies on the person claiming unjustifiable hardship.
14 Section 6 of the Disability Discrimination Act, dealing with indirect discrimination, is in the following terms:
6 Indirect disability discrimination
(1) For the purposes of this Act, a person (the discriminator) discriminates against another person (the aggrieved person) on the ground of a disability of the aggrieved person if:
(a) the discriminator requires, or proposes to require, the aggrieved person to comply with a requirement or condition; and
(b) because of the disability, the aggrieved person does not or would not comply, or is not able or would not be able to comply, with the requirement or condition; and
(c) the requirement or condition has, or is likely to have, the effect of disadvantaging persons with the disability.
(2) For the purposes of this Act, a person (the discriminator) also discriminates against another person (the aggrieved person) on the ground of a disability of the aggrieved person if:
(a) the discriminator requires, or proposes to require, the aggrieved person to comply with a requirement or condition; and
(b) because of the disability, the aggrieved person would comply, or would be able to comply, with the requirement or condition only if the discriminator made reasonable adjustments for the person, but the discriminator does not do so or proposes not to do so; and
(c) the failure to make reasonable adjustments has, or is likely to have, the effect of disadvantaging persons with the disability.
(3) Subsection (1) or (2) does not apply if the requirement or condition is reasonable, having regard to the circumstances of the case.
(4) For the purposes of subsection (3), the burden of proving that the requirement or condition is reasonable, having regard to the circumstances of the case, lies on the person who requires, or proposes to require, the person with the disability to comply with the requirement or condition.
15 The Disability Discrimination Act applies in a number of contexts, including education (s 22). In particular, s 22(2) provides:
(2) It is unlawful for an educational authority to discriminate against a student on the ground of the student's disability:
(a) by denying the student access, or limiting the student's access, to any benefit provided by the educational authority; or
(b) by expelling the student; or
(c) by subjecting the student to any other detriment.
16 Section 5(1) of the Disability Discrimination Act requires a causal link between the disability and the discriminator's conduct. This is made clear by the phrase "because of the disability, the discriminator treats …". In Purvis v State of New South Wales (Department of Education and Training) (2003) 217 CLR 92 (Purvis), in relation to an earlier version of s 5(1) expressed in similar terms to the provision as set out above, Gummow, Hayne and Heydon JJ said at [236]:
For present purposes, it is enough to say that we doubt that distinctions between motive, purpose or effect will greatly assist the resolution of any problem about whether treatment occurred or was proposed "because of" disability. Rather, the central question will always be - why was the aggrieved person treated as he or she was? If the aggrieved person was treated less favourably was it "because of", "by reason of", that person's disability? Motive, purpose, effect may all bear on that question. But it would be a mistake to treat those words as substitutes for the statutory expression "because of".
17 In the same case, Gummow, Hayne and Heydon JJ said the following (at [213]) in relation to the nature of the inquiry required by s 5(1):
Section 5(1) of the Act requires comparison between the treatment which the discriminator gives, or proposes to give, to the aggrieved person and the treatment that the discriminator would give, or would propose to give, to a person without the aggrieved person's disability "in circumstances that are the same or are not materially different". If that comparison reveals that the disabled person was treated less favourably, the further question which must be asked is whether that was because of the disabled person's disability. Section 5(1), therefore, requires equality of treatment between the disabled and those who are not. Attention is invited to how the discriminator "treats or would treat a person without the disability" (emphasis added). The "comparator" identified by s 5(1) is "a person without the disability".
18 Section 5(2) of the Disability Discrimination Act effectively imposes a positive obligation to make "reasonable adjustments" in certain circumstances. This provision was introduced by the Disability Discrimination and Other Human Rights Legislation Amendment Act 2009 (Cth). The background to, and reasons for, the introduction of s 5(2) were described by Mortimer J in Watts v Australian Postal Corporation (2014) 222 FCR 220 (Watts) at [15]-[20] and by Bromberg J in Sklavos v Australasian College of Dermatologists (2017) 256 FCR 241 at [34]-[35]. See also Rees N, Rice S and Allen D, Australian Anti-Discrimination Law (2nd ed, The Federation Press, 2014) at [6.3.6.15]-[6.3.6.17].
19 In Mulligan v Virgin Australia Airlines Pty Ltd (2015) 234 FCR 207, the Full Court of this Court (Flick, Reeves and Griffiths JJ), at [146], noted that the term "adjustment" is not defined in the Disability Discrimination Act and stated that, as Mortimer J had concluded in Watts at [22], the term is therefore to be given its ordinary meaning, which is "an alteration or modification".