I think the answer to that is yes. I think what you're asking is, how does this all start? The question really is, who can submit a complaint to the committee?
We know that it's the parliamentarian or the former parliamentarian whose fundamental rights have been violated, or a member of their family or their legal representative. It could be another parliamentarian. It could be a political party or a national or international human rights organization, such as the UN.
All complaints are submitted in writing, with evidentiary backup, to the president of the committee or to the IPU secretary-general. There is a robust collation of evidence. If it's not sufficient, the committee might send executives or analysts back to explore and try to get more information to buttress the case or to make a decision whether to go or not in pursuing the complaint.