I believe that has been brought up and discussed as one of the myriads of possibilities. The obvious response to your well described idea is this:
Then why is there absolutely no evidence of DW ever having been in the VD house?
Because the sexfests were in the *garage*? Sorry, I couldn't help myself. ("VD" house gets me, too). That's a good question tho. I wonder why the police haven't processed the other "unknown" fingerprints found in the house.
More and more it sounds like a frame-up.
Anyone hear Wendy Murphy's ugly thoughts on FOXNews today?
Hey, I'm no Perry Mason.