I'm not sure what you mean by a service standard both ways. Whether it's a public complaint, an internal investigation or a criminal investigation, those being investigated have a right to a procedurally fair and expedited investigation, period. That's the way I look at it.
The laws of natural justice should apply. Whether it's the CBSA being investigated or the RCMP being investigated, the member being investigated has a right to a timely completion of that investigation. He or she also has the right to silence. That's a common law: the right to silence. So, if that impedes the investigators, well, find another avenue.