Yes, search warrants in Canada can be more difficult to obtain, and execute. Remember the P. Bernardo case -- LE had a warrant to search his house, but could not take apart things like the light fixture in the ceiling, where of course he had hidden the horrendous tape. It was not that LE was incompetent, the judge restricted them too much IMO.
LE apparently carried many evidence bags full of items from CN's home. Perhaps they removed almost everything except furniture from her bedroom, and they may have taken many other items that belonged to the parents . It sounds like they had enough evidence for a serious warrant. I hope they could search possible hiding places well.
I suspect CN was perhaps at the scene of Tim Bosma's murder, or close by, and that she may have driven DM away in another direction from DM's accomplice, who could have driven the body to the farm. I suspect that DM and CN wanted an alibi, and distance from the actual murder crime scene - the truck -- asap after the murder.
It is also possible that she helped DM after the murder of LB. This girl could be in very deep, in not one, but two murders, and she may have had knowledge of the faked suicide murder of WM. She may claim she acted as she did, because she was so afraid of DM, but if that is the case, why did she not go to LE after DM was arrested and locked up ? Why did she ( or more likely her parents ) hire a criminal lawyer for her months ago ? That begs the question -- how much did they know, and are they guilty of hiding evidence as well ? The net is wide in this case. If people know things, IMO they should be talking to LE, not trying to hide in the shadows. I would not be surprised to see her parents brought up on charges after LE goes through the house evidence.
If CN is not talking to LE, and giving them the information they need, she soon will be IMO. News reports said she was shackled in chains around her ankles in court, and that she looked very nervous -- wringing her hands, and biting her lip. The parents may not have been there for support because they are very afraid. If they hired a lawyer for her months ago, then they knew a lot. I would say their business will go downhill significantly after the arrest. Who wants to go to a chiropracter involved in anyway with these crimes ? Not me, and not others I know, that is for sure.