I can certainly see the labs getting excited enough to mention this in their reports, having more tests done for it, discussing it with the investigator on a phone call, and the investigator in turn asking the forensic computer lab tech to look for it on the computers because it was a few parts per million over what would usually be found. I don't get it, as you refer to this being investigated to eliminate it, but it hasn't been. Second test showed....chloroform. Computer investigation showed....chloroform. Search after body found showed....we don't know yet. Back to your 'shovel theory', (and I did understand it as analogy when you first brought it up) the shovel was investigated, not as a murder weapon, but it has still been eliminated. The chloroform hasn't. We are just coming at this from 2 different directions. I am looking at this from an investigative point of view, therefore, because of evidence I have seen, I believe in the chloroform until it has been ruled out. My interpretation of the report as it stands is both cleaning solvents and human decomp have been ruled out as a cause for the unusually high levels found. Unless something else comes along, that leaves actual chloroform.
Lanie