Background Spectroscopy is an example of a forensic technique used to detect, in many cases, determine the composition and the quantity of a certain compound in a sample(Siegel 1997). Spectroscopy is defined as the measurement of the absorption, emission, or scattering of electromagnetic radiation from a surface by atoms or molecules (Siegel 2004, p. 2326). Absorption is the transmission of electromagnetic energy to the atoms or molecules; emission is the transition of electromagnetic energy from one energy level to another resulting in photon emission and scattering is when light is redirected when it interacts with matter (Skoog, Holler, & Nieman 1998). Principle When a primary X-ray beam of precisely known energy impinges on sample atoms, inner shell electrons are ejected and the energy of the ejected electrons is measured. The difference in the energy of the impinging X-ray and the ejected electrons gives the binding energy (Eb) of the electron to the atom. Since, this binding energy of the emitted electron depends on the energy of the electronic orbit and the element it can be used to identify the element involved. Further, the chemical form or environment of the atom affects the binding energy to a considerable extent to give rise to some chemical shift, which can be used to identify the valence state of the atom and its exact chemical form. This technique is mostly referred to as Electron Spectroscopy for Chemical Analysis (ESCA). ESCA is a well-established surface spectroscopy technique to provide effective chemical analysis of surfaces in given specimens. The method is of valuable use when elements of low atomic number and surface impurities are considered. The method is complicated and requires relatively high vacuum (UHV) conditions. The UHV conditions are typically below 10 to the -9 millibar. The atmospheric pressure is just 1 bar and therefore at UHV conditions the number of atoms is 1/1,000,000,000,000 that of air per unit volume. This condition is highly recommended for surface analysis as the molecules in the air will land to the surface and change the surface property. The atoms are attached to the surface in 3 seconds and cannot be analyzed since this time is not enough to experiment. The UHV conditions are required to provide several hours for the experiment to be completed. The UHV chamber is first prepared by pumping 10 to the -2 millibar using a rotary pump. A turbomolecular pump is then used to pump 10 to the -6 millibar. The vacuum chamber is enclosed in a tight oven and heated to about 180 degrees Celsius. The baking takes place for two days to remove any gas inside the chamber and it is then allowed to cool down. This attains the UHV chamber at room temperature. The output (results) is analyzed by identifying characteristics peaks as well as analyzing the peak areas. The instruments are linked to computers to assist in data analysis. The process of adhesive encompasses the surface condition and composition. ESCA or XPS has provided forensic scientists with an important tool to recognize the causes and location of failure. Introduction Electron spectroscopy for chemical analysis (ESCA) also known as x-ray photoelectron spectroscopy was first explained in 1905 by Albert Einstein (Wagner, et al. 1979). Einstein demonstrated that the energy of an electron ejected in the