mom, FWIW, when LE was first at the Cooper home, they probably just talked to Brad to get details. They were most likely using the home as the 'base,' for just the first day. That would be why they were there so late. There were probably people out looking and coming back to report.
Brad was cooperative and did allow LE to go through the home. But without a SW, LE could not remove anything nor 'move' anything. They could only view items that were 'visible' as they walked by. Like, if they saw a drawer that looked interesting, they could NOT open it and check the contents. IF they found something in a drawer they opened, for example, it could NOT be used as 'evidence.'
When LE does get a SW, it has to be very specific on 'what' they're looking for and 'where.' Like when they saw Nancy's purse in the vehicle, they couldn't take it without a SW.
I've seen where LE sees through a window, someone is murdered. But they've waited up to several hours before entering the residence, because they had to get a SW. IF they'd forced entered the residence, which appeared to be the crime scene, anything they found could not be used. They needed a SW.
JMHO
fran