"carry out prompt, effective, and impartial investigation of all complaints on the use of torture and inhuman and degrading treatment, ensure that the perpetrators are brought to justice, and that impunity does not prevail;"
The language of the resolution must be clear and avoid misinterpretation. "Prompt, effective, and impartial investigation" is standard terminology. All complaints of the use of torture should be investigated, not just confirmed violations. Reference to impunity is important.