A Six-Pack of Tips: Crime Scene Investigation
Writers sometimes fail to capture what really goes on beyond the yellow tape at crime scenes. The reasons vary for these unfortunate omissions of solid information, but one theme is common … the use TV or film as research tools. How awful, right?
The little things often go unsaid, even though those details are often quite important!
So what are authors missing when they use television as their sole source of cop-type information?
Well, here’s a six-pack of helpful hints for those characters whose duty is to investigate a crime scene.
1. Death Scene Documentation, Evidence Collection, and Chain of Custody of the Body
Before the medical examiner enters the scene, be sure to preserve any evidence that may be altered, contaminated, or destroyed. You certainly wouldn’t want the M.E.’s footsteps to wipe out the suspect’s shoe prints, alter blood stain evidence, or mar tire impressions. Document the M.E.’s time of arrival, who called him and when, and what time the body was removed from the scene. Also, make note of the seal number placed on the body bag, if a seal was used. If not, note that the M.E. did not seal the bag and have an officer escort the body to the morgue, if possible. This simple act keeps the chain of custody intact.
2. Water Scenes: What’s Important? – Always document the water type (pond, river, lake, creek, etc.). Record the water temperature and the depth of the water where the body was found, if possible. Make note of and photograph the surroundings. It’s possible that the victim had been swinging from the rope hanging from the limb in that large oak tree, slipped, and then fell onto that large rock jutting out of the water. Everything is a clue. Record the position of the body in the water. Was it face down, or face up? Totally underwater, or floating? That could help determine how long the body had been in the water. Follow the clues!
3. Shoes – Everyone entering a crime scene should wear shoe covers. If not, pay particular attention to their shoes. Yours included. Photograph the bottoms of everyone’s shoes so you’ll be able to recognize the tread patterns when comparing impression evidence back at the office or lab.
4. Photograph Impressed Evidence – Always take a picture of impressed evidence (tire tracks, footprints, etc.). If something were to go wrong while you’re processing evidence and you hadn’t photographed before you started … well, you’re, as they say … SOL.
5. Fingerprinting Wet Surfaces – Don’t let a little rain stop you from lifting fingerprints. There are a couple of ways to obtain a good set of prints from wet surfaces—Wet Print, a spray on mixture that develops black prints instantly, and SPR, another spray on product that requires a little mixing before applying.
6. Gloves – Use a different pair of gloves when handling each piece of evidence. This is an important step that prevents cross-contamination. You certainly don’t want to transfer someone’s DNA from room to room, especially if that makes an innocent person appear to have been somewhere he hasn’t! And, it is possible to leave your prints on a surface even while wearing thin, latex gloves. Cotton gloves eliminate this problem.
Lots of things to remember. Hopefully, in time it becomes a habit to do so.