Introduction: over the centuries; researchers, scientists and engineers have brought great innovations to the world. These innovations are not limited to any single field, but have instead been shared across all. Whether it's advanced weapons and guidance systems or the remote control that controls television, progress has been made. One of the most notable advances has been in the field of criminology. Two new technological tools that have had quite a large impact are infrared spectroscopy and chromatography. An unidentified body was found. An external examination of the body revealed numerous needle marks, bruises and thrombosed veins in the cubital fossae. The head showed signs of blunt trauma and small fragments of paint and metal had been removed from the wound. Analysis of the stomach contents revealed some partially digested chips and some partially digested pills. A small amount of residue was extracted from the pond for analysis. Footprints were evident on the carpet where soil had been embedded. Soil samples were collected from these footprints. This analysis will show how infrared spectroscopy and chromatography would be useful in finding both the cause of the murder and possibly who the culprit was. Infrared Spectroscopy: Infrared spectroscopy was first used in the 1950s by Wilbur Kaye. He designed a machine that tested the near-infrared spectrum and was able to provide the theory to describe the results. There have been many advances in the field of IR specifications, the most applicable being the application of Fourier transformations. ”The Fourier Transform is an instrument that decomposes a waveform (a function or a signal) into an alternative representation, characterized by a sine and...... center of a sheet of paper... the Fourier spectrometer mass. This is called an electron impact source. Gases and volatile liquid samples can enter the ion source from a reservoir. Solids and non-volatile liquids can be introduced directly. The cations formed by electron bombardment (red dots) are pushed away from a charged repulsive plate (anions are attracted to it) and accelerated towards other electrodes, equipped with slits through which the ions pass like a beam. Some of these ions fragment into smaller cations and neutral fragments. A perpendicular magnetic field deflects the ion beam along an arc whose radius is inversely proportional to the mass of each ion. Lighter ions are deflected more than heavier ions. By varying the intensity of the magnetic field, ions of different masses can be progressively focused on a detector attached to the end of a curved tube. Because the mass of each individual ion