Red herrings

[shwanalynn]

No: HPFGUIDX 80239

I keep hearing about JKR's use of red herrings, and I'm wondering if 
anyone would be willing to tell me if she's actually admitted 
outright to using them, or if we've just deduced their existence over 
the years?  I'd be really interested to read any interview that 
refers to her use of red herrings if there are any out there.  I have 
tried searching for clues in the posts on this website, as well as on 
the Quick Quotes site, and the HP Lexicon site, but haven't found 
anything, really.  Is this because I'm looking for something that 
doesn't necessarily exist?

Thanks to anyone that can help!
~shwanalynn