I'm not certain which word you're talking about. I'm certainly not attempting to avoid any particular words. I simply prefer truth in advertising.
Let me delve a bit deeper. An investigation to determine wrong-doing does not mean those people associated with the wrong-doing or the investigation have done anything wrong. That's why they have an investigation—to determine what, if anything, happened and who, if anyone, did it. For example: I was in a car accident ten years ago, a five-car pileup. I didn't cause the accident, and I did everything my defensive driving instructor told me, and the law required. However, that didn't stop the police from questioning me about the accident, in the course of a full investigation to determine wrong-doing. I was present, I gave my statement, as did other witnesses. The police took several weeks to sift through everything. At the end it was determined that although I was part of the accident, I had no fault in causing it, and no fault in any of the subsequent damage that occurred.
One can be part of an investigation, even a criminal investigation, and yet that investigation is not actually into them specifically. That's certainly the case here.