I saw this before, but some of what the coroner said was walked back. Obviously the students weren't likely sleeping as it turns out, and least one of them wasn't unless Xana was an eat and pass out asleep kind of person (could happen). IMO, the coroner spoke before she should have, so I don't trust anything she opined.
The link you gave had no information about the drips on the side of the house that I could find, though.
ETA: This interview has a longer version of the interview. It has what you are looking for around 5:06
Video: Coroner speaks after autopsy of slain University of Idaho students | Daily Mail Online
The coroner had not tested it, she was going by her visual observation (Reporter Question: "Does this seem congruent with the results of the crime scene that you were able to ascertain from your work?" Answer:" From my observations, yes."), so not actually confirmed. I don't know if it has ever been confirmed yet.