Hell yeah

It's verbatim from the legislation. For context:

69ABEA Proof of domestic violence

(1) An employer may require proof that an employee is a person affected by domestic violence to be produced—

(a) to the employer; and

(b) by or on behalf of an employee; and

(c) for the purposes of a request made by or on behalf of the employee; and

(d) as soon as practicable after that proof is required by the employer under this section; and

(e) within 10 working days after the employer receives the request.

(2) However, the employer may require proof of that kind only if—

(a) the employer informs the employee as early as possible that the proof is required; and

(b) the employer requires the proof within 3 working days after the employer receives the request.

So, your employer can require proof that DV is affecting you within 10 working days of you making the request. As for why they can refuse:

69ABF Grounds for refusal of request by employer

(1) An employer may refuse a request only if the employer determines 1 or both of the following:

(a) that proof required to be produced under section 69ABEA was not produced within 10 working days after the employer receives the request:

(b) that the request cannot be accommodated reasonably on 1 or more of the non-accommodation grounds specified in subsection (2).

(2) The non-accommodation grounds are—

(a) inability to reorganise work among existing staff:

(b) inability to recruit additional staff:

(c) detrimental impact on quality:

(d) detrimental impact on performance:

(e) insufficiency of work during the periods the employee proposes to work:

(f) planned structural changes:

(g) burden of additional costs:

(h) detrimental effect on ability to meet customer demand.

(3) An employer must not refuse a request just because—

(a) the request is from an employee who is bound by a collective agreement; and

(b) the request relates to working arrangements to which the collective agreement applies; and

(c) the employee’s working arrangements would be inconsistent with the collective agreement if the employer were to approve the request.

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