Be Prepared with the Essential Equipment
You can make your job more manageable by paying attention to the fundamentals. One of the most important things you can do is determine the equipment that is essential to your job. As you gain experience and expertise, the list of equipment will certainly grow and include more specialized items.
There are numerous crime scene supply companies out there that have put together basic crime scene kits. If you decide to go with this option, you’ll probably need to purchase multiple kits in order to have an adequate amount of supplies. You’ll also need to supplement these kits with other supplies.
First, you need a fingerprint kit. This kit should include different types of powders and brushes to identify prints on different surfaces. For basic prints, you need black powder and a fingerprinting brush. You may want to add white, gray, or silver powder to your kit. These light color powders provide contrast, so they can be useful when prints appear on dark surfaces. If you do use different color powders, you need a dedicated brush for each color powder to avoid contamination. You also need magnetic powder and a magnetic powder applicator. Magnetic powders are sometimes more effective on rough, grained, or porous surfaces, which could become heavily coated with regular powder. You should also include fluorescent powder and a feather brush. This type of powder is used on multicolored surfaces, like soda and beer cans which can present a contrast problem. Note that you also need an alternate light source or a UV light when you use fluorescent powder. When working with any of the powders, you need disposable dust masks and nitrile or latex gloves. You also need a small hand-held magnifier to view the prints.
Once you have the prints, you need to lift them. For smooth surfaces like glass, you need 2" and 4" lifting tape. For multi-contoured surfaces, such as light bulbs and door knobs, you also need 1½" polyethylene tape.
After you have lifted the prints, you need to store them on backing cards. For black powder, use white backing cards. For white, gray, or silver powder, use black backing cards. Fluorescent powder prints are put on black backing cards. Magnetic powdered lifts are placed on contrasting colored backing cards.
In addition to the fingerprint supplies, you also need equipment specific to DNA collection. This includes sterile swabs, sterile distilled water to moisten the swabs, and swab boxes. The swab box allows the swab with the DNA sample to air dry safely.
You also need supplies for collecting different types of evidence. These include Ziplock bags in assorted sizes; paper bags in assorted sizes; evidence tape to preserve the chain of custody; and permanent markers, ink pens, and pencils to mark the items being collected.
Photography equipment is also very important because you must photograph the scene as a whole before you do anything else. Once you’ve photographed the scene as a whole, then you must photograph specific pieces of evidence, like fingerprints, before you do anything with that evidence. Since photographs can be so crucial to a case, you should use a good quality digital camera, A-frame photo markers, photo scales, and a tripod.
In addition to photographing the scene, you also have to diagram it. The supplies for this task include 6" scales, L scales, 12" rulers, tape measures, and graphing paper.
Finally, your crime scene kit will include a variety of additional items. These will include basic supplies like scissors, tweezers, a flashlight, and personal protection equipment (gloves, booties, etc.)
From: Crime Scene Equipment by Dick Warrington