Examining Grains And Particles

Just as forensic scientist can identify threads and fibers under a forensic comparison microscope, they can also distinguish between tiny objects. Grains and particle may be found trapped in a suspect’s clothing or in the grooves on the soles of shoes. Matching these grains found at the scene of the crime or in a stolen car, for instance, may help to identify the guilty person or determine where and how a crime was committed using a forensic microscope. Examination of crystal under a forensic microscope such as a forensic comparison microscope can reveal whether grit found in the bottom of a teacup is undissolved sugar or ground glass used to try and harm a person. You can closely examine this under a forensic microscope.

To hide evidence such as dust brushed off furniture or particles picked up his shoes and then left on his car seat or floor mat, a burglar may have vacuumed his car. Forensic scientists examining the contents of the cleaner-bag will take away any particles they find for microscopic examination. In this case they were able to match sand and grit particles from the bag with those from the path to the burgled house using a forensic comparison microscope.

You can practice being a forensic detective or scientist by examining common objects found in your environment with the use of a microscope.

To prepare a cell slide, place a drop of clean water containing the cells on the glass slide. With a wire loop that has been cleaned and sterilized in a flame, spread the fluid thinly and let it dry. Add a small drop of staining dye to the cells and leave for a few minutes. Wash off the dye with water or alcohol. You can stain with another, contrasting dye. Leave the slide to dry. You can speed up drying by gently warming the slide over a flame. Place a cover slip (a thin square of glass) over the stained cells, using a pair of tweezers. Put the slide on the microscope stage. Select the objective lens you want, then move the eyepiece up and down to focus. Start at the lowest magnification. Document your results and findings. Keep your prepared slides in a wallet made from a folded sheet of cardboard, which will protect them from the dust.

Arrange some specimens of sugar, pollen, and tea so that you can see whether your friends can identify them through a microscope. With a microscope, compare the edges of sheets of paper, as above, cut with scissors, the edge of a ruler or torn with your hands. See if you can fit together small pieces of paper torn from a single sheet.

Ask some of your friends or relatives to make fingerprints on a glass tabletop. Brush talcum powder very gentle into and around the prints. Blow away any surplus powder. Then press a piece of sticky tape onto each print. Finally, peel the tape off carefully and their fingerprints will come up with it. Stick the tape onto clack cardboard or paper to examine its better. Compare the prints with fingertips and see if you can match prints to people. This is the basic experiment for an aspiring detective. You can also compare two fingerprints samples using a microscope.

5. Software 4. Fabric or Fiber Analysis The principles behind fabric or fiber analysis are the same as the ones that hair strand inspection follows. Just like hair strands, it is possible that the criminal’s shirt or pants had caught in a nail or the victim’s grasp in the crime scene. Small evidences like there are placed under the forensic comparison investigation microscope so that detectives will have a fair idea as to who the suspect was. The color and the type of fabric the suspect wore can be used as an indication of what type of person he is, what work he does, and probably, if other people had such seen such a person wearing that color of a shirt inside the premises.

5. Documentation of Evidences Evidences are nothing if they cannot be properly documented for further reference. And this job becomes easier with forensic comparison investigation microscopes as well. These microscopes are not merely used to investigate crimes. It also has the ability to store evidences through a digital image on a computer, a database, or a secured server. This is the same reason why investigators can easily involve and rule out suspects. Those are the five major applications of forensic comparison investigation microscopes. With all of these, it is very safe to say that these microscopes play a big role in promoting justice in the society.

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