Why is there a need to explain it ? The only relevant hairs are Danielles ?
The presence of the hair in the trap. The likelihood that a hair would have shed, plus found its way in the drain, plus got caught and not washed down is slim to none in my opinion.
Someone elses hair was shed and caught and not washed down, why is it hard to believe hers wasn't?
That was sarcasm, right? If not, I guess I can see how you developed your opinion. :)
The only hairs relevant are Danielle's,
The only (hairs,fibers,prints,etc) relevant are Westerfield's.
Just ignore those other hairs,fibers,prints you found. They don't mean anything.
Thank you for your co-operation
(signed, the real killer)