Tech Tuesday - Applications of lasers in crime scenes

Applications of lasers in crime scenes

FARO Laser Scanner provides a precise record of the whole scene by touching the button this permits the site be returned to its normal after a short time. A 3D scanner replaces crime scene sketches. Forensic scientists have come up with a technique which analyzes line of sight, blood group antigens and bullet trajectories to harmonize other techniques like offender’s height evaluation from surveillance video. The applications include

        i) Preserves evidence digitally

Evidences collected from the scene using 3D laser scanner are preserved digitally, so that investigators can use data stored from the crime scene to carry on their investigations. Investigators operating exclusive of the help of laser scanners, data is lost. With the use of digitally preserved crime scene, investigators can trace back - virtually - and get the measurements needed. It also provides the view of whatever it has captured like a person.

ii) Room visualization

This is achieved from one or more color range data files. A 3D color model offers realistic views of scanned scene. With the use of several software tools measurements for any scene within a certain point can be collected.

iii) Bullet Trajectories

Implementation of laser scanner on to the workflow generates benefits. Once the laser has scanned data it is brought into a software program where the data points are registered, hence a 3D photorealistic model is generated. Addition of 3D sight lines on to a model for simulations and analysis enables investigators to calculate easily bullet trajectories. This model is used in courtrooms to accurately and also interactively bring adjudicators to the crime scene. Generating this model of a scene aids the jury to come up with decisions through judgment. The versatility of laser scanners provides for high resolution credentials for both indoor and outdoor scenes thus helps the investigators to develop efficient workflow within a shorter time.

iv) Blood stain analysis:

Blood stain is one of the forms of evidence in crime scene. Laser technology in conjunction with FARO Scene Bloodstain plug in is authenticated and highly efficient technique for performing area-of-origin analysis with an advantage of incorporating non-orthogonal surfaces. This has enabled technicians to work with blood stain photos using 3D model hence produce blood trajectories which are viewed within the scene.

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