Feldman not only has to exonerate Westerfield, but actually do a Perry Mason and tag the real killer in court. (I'm not even betting this is possible).
We could use the DNA factor to get DW off. There HAS to be traces of his DNA somewhere in that house for him to have kidnapped Danielle. (The visual mind-scene of DW lurking in her closet as stated, would certainly provide skin-cell DNA...AND let's not forget how DW "sweated profusely" under stress...LOL!)
But wait, didn't Damon vacuum the house? Whoops! Nevermind the DNA...Damon is a real "Mr. Mom" with the house-cleaning...isn't he?
sw