Impression Evidence Photography

Tire Impression Lighting From North: This photo is of a tire impression on dirt. After photographing an overall and medium view of the tire impression that is the clearest at the scene, The camera is inverse mounted onto a tripod or mounted ontp a quadrapod to get a stable photo. Since the shoe impression was out in an area that had various amounts of shade and sunlight patterns around the evidence, an umbrella was held above the tire impression to have even lighting to start with. After taking the time to set a measuring tape as well as a scale next to the impression, we set the tripod above the impression allowing us to capture sections about 1 ft. in length, each photo will overlap by a small amount to be able to print out the photos and place them next to eachother accurately if needed. The photos will be taken with a flash unit angled at 15, 30 and 45 degree angles on each side of the impression to allow for different details to be seen for the purpose of comparison.

ISO: 100 Aperture: f/16 Shutter Speed: 1/100

Shoe Impression Lighting From East: This photo is of a shoe impression on dirt. Similar to the tire impression, there need to be orientation and location photos of the shoe impresion, then medium views to show it in relation to other impressions if there are any around. All photos need a north indicator as well as a scale, to accurately show the size of the impression for comparisons. The scale should have L shaped and be places in a way that measures both length and width of the shoe impression. Like with the tire impression, the shoe impression with be taken with an umbrella or other item covering the sunlight, if there is any, and from each side with a flash unit at 15, 30 and 45 degree angles to show different details of the impression. Taking multiple of the same photo with focuses at different distances can help get the most detail out of the impression. ISO: 100 Aperture: f/16 Shutter Speed: 1/80 Sec.

 

Dusty Shoe Impression: One type of impression evidence is a 2-dimensional dusty shoe impression that can be left at a scene. This photo was taken using a camera mounted on a tripod to have a stable camera and clear photo of the evidence. When encountering a dusty shoe impression, a gel lift can be used, instead of a tape life like with a fingerprint, to be able to lift the entire impression with one lift. The impression will not be visbale at first but, using oblique lighting, will be able to be seen better. The eviedence is best photographed in a dark room to allow for the oblique lighting to be most effective. A scale is always placed next to the impression to allow comparsion to be done accurately. ISO: 100

Aperture: f/22 Shutter Speed: 30 Sec.

Shoe Tread Photo: Shoes are also a big part of impression evidence. This photo is an example of footwear that could be found at a crime scene or taken from a suspect. Using a camera mounted on a quadrapod, we can get a clear photo of the tread on a shoe that could be compared to 2-D or 3-D impressions. The shoe must be propped up using clamps or other devices to hold it still. A dark room is a good palce to do the photography to get a dark background to allow for the focus to be on the shoe tread. A light source should be held to illuminate the shoe clearly enought to get a good photo of the detail. An L shaped scale should be held by a clamp in such a way that it can measure length and width of the shoe. This photo will require a high f-stop to get the most detail from the shoe. 

ISO: 100 Aperture: f/22 Shutter Speed: 1/6 sec

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