Personally it makes me wonder if they did not find the blood of one or the other of the adults?
According to opening remarks by the Crown, they found the DNA of 2 victims on a saw, and of the third victim on meat hooks, all located at the Airdrie property. It doesn't say *when* that evidence was discovered though. Officers travelled to Mexico approx one month after the 'event', at which time DG was already charged with 3 murders.
(This article is from August 5, 2014, and interesting to note that it appears that PG and AL were already separated by then, only a month after this event?):
http://www.theglobeandmail.com/news...n-missing-liknes-family-case/article19927438/A police spokeswoman confirmed on Tuesday that officers are in Mexico.
“It’s just making sure that all the avenues are covered. There’s nothing to it other than just crossing t’s and dotting the i’s,” said Calgary police spokeswoman Emma Poole.
....
Douglas Garland, 54, is facing two charges of first-degree murder and one count of second-degree murder.
The first-degree murder charges are in connection with the Liknes couple, while the second-degree charge is related to Nathan’s death.
Police lay first-degree murder charges when they believe they can demonstrate “preintent,” Calgary Police Chief Rick Hanson said when the charges were laid. They apply second-degree murder charges when “preintent – the intent to commit the act – may not be there.”
....
Throughout early July, police searched the fields around the home near Airdrie, Alta., where Mr. Garland lived with his parents.
Teams also picked through Calgary’s municipal dumps. The searches continued until July 13. Mr. Garland was arrested very early the next day on the porch in Airdrie. On July 15, Mr. Garland was charged with three counts of murder.
Mr. Garland is scheduled to return to court next week on the murder charges. His sister, Patti, was in a common-law relationship with Alvin and Kathryn Liknes’s son Allen.