There was likely some trace evidence in the barn, or in the near vicinity of the incinerator. There was tv news footage of police carrying a plank out of the barn with a paper bag over one end. There was speculation at the time that Laura's body may have been tied to it, and moved this way. The bag could have been covering blood and/or hairs on the plank. If either were there, and contained her DNA that would be quite strong evidence. If they had that, along with a statement from a witness, I can see them reaching the conclusion that she was murdered, and that the body was disposed of on the farm.
Well, to reprise, the provincial Coroner's Office said they'd never examined Laura Babcock's remains, which it would be required to do if the remains were found in Ontario.
http://www.thestar.com/news/gta/201...a_babcocks_body_not_recovered_in_ontario.html
After extensive searching of the Millard Ayr farm in June and then again in September, the two relevant LE jurisdictions released statements that no "significant connection" relating to the deaths of either DM or LB had been found. However, there was a tag on to the Toronto LE that items taken from the farm had not yet been forensically examined so we may yet learn that importance evidence was found, after all.
http://m.570news.com/2013/09/20/no-...rance-of-laura-babcock-found-at-millard-farm/
I don't know what relationship, if any, exists between police and coroner. I would have thought that, on the basic of record keeping alone, if a death occurred in Ontario, that information would have to be noted somewhere even if only scraps of remains, DNA or whatever exist. Would the Coroner's office be brought into the information loop? Anyone know?
On a side note, here's the snazzy Ontario Centre of Forensics Sciences website, if anyone is interested.
http://www.mcscs.jus.gov.on.ca/english/centre_forensic/cfs_intro.html