If a person was reported for doing something inappropriate, the GPs will have to cover all bases of the investigation. Even if the report did not specify anything about PMs, staff members still have to look at them since the inappropriate behavior could have easily ensued over PM.

The report may have also been made by a less experience player, who maybe doesn't know what a PM is, or maybe the reporter just forgot to include that it was over PM. All of these factors have to be taken into consideration when investigating a report.