Human rights — Torture — Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment, 1984 — Article 1 — Torture — Article 3 — Non-refoulement — Article 22 — Communications to United Nations Committee against Torture — Australia — Asylum — Persecution — Claim for asylum in Australia — Claim refused — Whether removal from Australia to Sri Lanka violating United Nations Committee against Torture — Individual communications — Admissibility of communication — Substantiation of claims — Inadmissibility on basis of insufficient evidence