There are two things. Cases can be referred to me, especially by members of Parliament, or there has to be a reason to believe that a public office holder or former public office holder has contravened this act. If I have reason to believe this, then I can say that I want to make an investigation. If there isn't, or if there are just some vague suspicions or allegations that come out that don't amount to a reason to believe, then I don't do it.
It's a discretion vested in me to decide whether there is reason to believe.