However, first, LE has to have probable cause to conduct the search.....and persuade a judge to issue a search warrant based on whatever probable cause they have.....for instance, new evidence.
Leni
The link provided at #20 by Andy’s Mom (second story at link) mentions comparing the duct tape and bag to that found in Casey’s car - I didn’t recall reading before that they had found those items in her car but that is pretty damning.