That's more than I know.
If you're suggesting it's impossible to be so drugged that you don't remember stuff, I'd argue that drunks often experience blackouts.
Whether or not Hetherington ever took drugs I don't know, it's an allegation by someone who claims to be his daughter ... I just posted it for the sake of the discussion.
If he was too drugged to know that he did not commit the crime, then he was also too drugged to know that he was guilty of the crime. Hetherington's supposed daughter claims otherwise, which makes no sense. A blackout does not cause a person to forget what he is innocent of, but remember what he is guilty of.
The daughter was apparently not a witness to the ostensible crime, so her statements are just opinions. She sure sounds confused. She seems to believe that her father's innocence or guilt of spousal rape has to do with matters unrelated to the crime, such as his drug abuse and his hairstyle.