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As for the paving question, you're assuming that because something looks unusual to you, it must indicate a cover-up. What evidence do you have that investigators had not completed the relevant forensic work before the site was altered? Suspicion isn't evidence. If there is proof that procedures were violated or evidence was destroyed, let's look at it. Otherwise, you're treating an unanswered question as proof of a conspiracy.
Because reality doesn't work like a TV show.
"For a murder, you're talking about a much more comprehensive and therefore much more time-consuming examination. For a start, everything in the scene is first photographed and videoed. And the scene would extend to all the possible exits, entrances, and routes between.
Then we get down to the details. Every footprint, partial footprint, trace of footprint, must be diagrammed, measured, photographed with scales. Every area of blood has to be assessed is it spatter? Drops? Smears? - measured, diagrammed, and photographed. Blood samples have to be taken from all areas and the exact position must be recorded, both in diagrams and photographs.
You've got several hours work there alone, and not just for one person either. Two CSI's at a minimum, three more likely, and a Crime Scene Manager deciding strategy and directing operations. So far, you haven't even begun on fingerprinting, or recovering items for lab work.
Most murder scenes will take several days to process properly. Quite apart from the work done by the CSI's, outside experts will often be called in. A Pathologist, to look at the body in situ before it's taken for a full post mortem. A Blood Pattern Analysis expert. A Ballistics expert if a gun was involved. If a gun has been left at the scene, that requires special treatment from a Firearms Officer. And so on."