In the affidavit for search warrant it notes that the dog at DW's house was very interested (or similar language) in an area of the garage. That twice the dog went to that area and sniffed extensively, though they note the handler didn't consider it a full "alert".
I can't look it up as I'm on my way out the door. I can't recall if the affidavit states a name of the handler and/or the dog, but the transcript reflects the judge asking questions about this incident.