Introduction to chemistry. Fundamentals of organic chemistry. Definition and description of a forensic analysis. The sampling problem in forensic science. Sample conservation. Matrices that can undergo investigation. "Quality assurance" in the forensic field. Critical evaluation of the results. Review of the main analytical techniques in the forensic field. Spectroscopic techniques. Application of spectroscopic techniques to forensic investigations: mass spectrometry techniques and its application to forensic investigations. Application of various hyphenated and non-hyphenated analytical techniques: nano chip LC, GC, head space/GCMS, SPME/GCMS, ICPMS, gel electrophoresis. Application of optical microscopy and SEM for the analysis of surfaces. Analysis of substances of abuse and doping substances. Analysis of fires and explosions. Organic explosives and inorganic explosives. Analysis of gunshot residues. Analysis of the different types of matrices (hair, fibres, blood, urine, organic liquids, fingerprints, paint, gunshot residue, etc.). Qualitative and quantitative analyses. The problem of false positives.