Tadese v Minister for Immigration

This case concerned an appeal by Mr Tadese against a decision of the Minister for Immigration, which affirmed a decision by the Administrative Appeals Tribunal. The Tribunal had affirmed the delegate's decision to refuse a visa application. The central dispute revolved around whether the applicant and the visa applicant were in a prohibited relationship, specifically as half-siblings, which would render their marriage invalid under the *Migration Act 1958* (Cth) and the *Marriage Act 1961* (Cth).

The primary legal issue before the court was whether the Tribunal had erred in its assessment of the evidence, particularly the 2012 DNA test results, and the applicant's subsequent refusal to undergo further DNA testing. The applicant contended that the 2012 DNA test results were "objectively inconclusive" and that the Tribunal failed to properly consider this, as well as the subsequent correspondence. The Tribunal, however, considered the 2012 DNA test results to be "probative evidence" and "extremely relevant" in determining the relationship between the applicant and the visa applicant, despite acknowledging they were not definitive.

Judge Riley reasoned that while DNA results inherently deal with likelihoods rather than absolute certainties, the Tribunal's task was not to establish absolute genetic truth but to be satisfied that the parties were not within a prohibited relationship. The Tribunal found that the 2012 DNA test, which indicated a 66 to 1 likelihood of the parties being half-siblings, was probative and highly relevant to this assessment. Furthermore, the Tribunal considered the applicant's refusal to undertake further DNA testing, despite the matter having been remitted for that specific purpose, as a significant factor. The Tribunal ultimately concluded that it was not satisfied that the applicant and visa applicant were not within a prohibited relationship, and therefore, their marriage was not valid for the purposes of the Act.

Consequently, the Tribunal affirmed the delegate's decision, finding that the visa applicant was not the spouse or de facto partner of the applicant. The court upheld the Tribunal's decision, finding no jurisdictional error in its assessment of the evidence and the application of the relevant legal principles.