User blog comment:Donut4/ANOTHER QUESTION!/@comment-24370354-20140102192824

Runcorn was an investigator of the uggle-Born Registration Commission, whose job was to uncover wizards of Muggle ancestry so that they could be sent to Azkaban or worse.

If you were Mr Weasley, would you have listened to him ? If you were Harry, would you have been confident enough to try and convince Mr Weasley that it was you and to listen to you without arising suspicion ?