01/18/2017 04:51 EST | Updated 02/08/2017 02:47 EST

Douglas Garland Trial: Officers Hoped Nathan O'Brien Was Hiding, Not Dead

Investigators were confronted with a bloody scene the moment they stepped foot in the house.

Warning: Graphic details and testimony are included below.

CALGARY — Police officers held out hope a five-year-old Calgary boy could still be alive after he and his grandparents were initially reported missing.

"We were asked that when we first got to the scene ... to search the house to see if we could locate Nathan O'Brien who may be hiding,'' testified Const. Derek Alexon, the first forensic expert to enter the home of Alvin and Kathy Liknes on June 30, 2014.

"Did you find Nathan O'Brien?,'' asked Crown prosecutor Shane Parker.

"No we didn't.''

Douglas Garland, 56, is on trial on three counts of first-degree murder after the couple and five-year-old Nathan vanished from the couple's Calgary home. Their bodies have not been recovered.

Douglas Garland is escorted into a Calgary police station in connection with the disappearance on July 14, 2014. (Photo: Jeff McIntosh/The Canadian Press)

The 11-man, three-woman jury heard from the first responders to the Liknes family home after their disappearance.

"We were told there was what was believed to be blood on three levels. We also had information there could possibly be a kidnapping or robbery,'' Alexon testified.

Const. Trevor Matthes was one of the first officers to arrive after police received a 911 call from Jennifer O'Brien, Nathan's mother and daughter of Kathy Liknes. He said he immediately noticed a partial bloody footprint when he entered the home.

Alvin Liknes (left), Nathan O'Brien (centre) and Kathy Liknes (right.) (Photo: Calgary Police Service)

He also found blood in hallways, in bedrooms and on the wall.

"I did note that there was a lot of blood down that south hallway leading into the bedroom. I noted that blood again as I exited. It appeared to be that there was almost like drag marks through that blood as it went downstairs to the main floor of the house,'' Matthes testified.

He said the blood trail and drag marks led out the door to the attached garage where it stopped in a pool of blood.

Matthes made another gruesome discovery when he went into the home to try to find the couple's cellphones.

"There was a workbench in front of me. What I noted was there was a dumbbell that was stuffed underneath the workbench but the end of it was just protruding a little bit. I noted there was some blood on that dumbbell,'' he said.

"As I proceeded back through the hallway to attend to what we call the main floor I noted what I would consider to be a tooth — it was laying in that back hallway where it exited out to the east side of the house.''

Afternoon testimony revealed officers eventually found a second tooth and an earring, belonging to Kathy Liknes, on a floor in the house. Two 45-pound dumbbells were swabbed for blood and sent away for forensic examination.

Matthes said he also checked throughout the house, including in closets and under the beds, to see if anyone might be hiding or injured and unable to call out.

I noted there was some blood on that dumbbell."

Alexon said DNA evidence of the three victims was gathered immediately. He said police seized a toothbrush belonging to Kathy Liknes, a razor belonging to Alvin Liknes and hockey equipment used by Nathan.

He was asked how a real crime scene was handled compared to forensic crime TV shows.

Calgary police investigators check out the home where five-year-old Nathan O'Brien and his grandparents Alvin and Kathryn Liknes disappeared on Wednesday, July 2, 2014. (Photo: Jeff McIntosh/The Canadian Press)

"In the fictional shows, of course, everything happens within an hour. They have equipment or resources within their offices that can identify people right away or get results,'' said Alexon.

"In reality, it's not like that. We go to the scene, we collect the exhibit. We will package them and get them out to the lab. That can take days, weeks.''

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