The use of saws in crime scene analysis is sometime used to remove floor boards to see what is there, often the perpetrator believe they have completely cleaned the floor of evidence however evidence seeps through to the floor boards and joists underneath. Also they use the saw to remove pieces of the wall that may contain evidence.
The bins often contain Luminal and Phenolphthalein tests equipment to spray the room to look for blood stain that has been cleaned up.
Also these are the normal stuff in those containers:
EVIDENT Fiberglass Brush , EVIDENT Camel Hair Brush, EVIDENT Magnetic Applicator ,Black Powder Black Magnetic Powder ,QuickLIFT Tape Pad ,Printed White Backing Cards ,Evidence Security Bags
Evidence Security Bags ,Small Printed Paper Bags ,Evidence Security Strips ,Sterile Plastic Tweezers
Sterile Cap-Shure Swabs ,Sterile Water Ampules ,Nitrile Gloves ,Magnifier ,Maglite LED 2D Cell Flashlight Gray 6" Scale ,Black Sharpie Marker ,EVIDENT Bic Pen ,Tactical Waist Pack, small shop vac, Vacuum bags. Shoe covers.
All Completely sterile