Fucksake. He's got the whole of a big, big office building to hold an interview. He wants to avoid a leaving party in one room in that big, big office. So, rather than going to another room on, say, a different floor, he chooses to go to his flat where apparently the imperative of avoiding being near to a noisy and illegal party suddenly disappeared.
And that interview just happens to be with someone his wife claims to be her best friend, so he shouldn't have been interviewing him at all. And we're asked to believe that Carrie was throwing a hell of a party, her husband and her bestie were just down the corridor, but neither of them took any part in the party? And it didn't occur to her husband to suggest that the party could not happen because, y'know, he'd been spending weeks telling the electorate that they couldn't have parties?
Honestly, if any police officer swallows that excuse, he isn't fit for office.