The QDC No. 1 (Quad of Criminology) we gave thanks to Edmond Locard for having stated his famous principle Transfer ( Quiscunque tactus vestigia Legat, all contact leaves its trace) or, put another way, the scene of the crime is something the offender and it takes some of the scene .
However, there is no physical evidence does not mean that we should shelve the issue because the research avenues are exhausted in the absence of those. If there are not material, we can use the psychological (think of the film Seven) and also reach a satisfactory solution. I think that in the end it's all about the effort we put into the job. Surely those who have had the task of investigating every day for years, have come to the modest conclusion that it's hard not to find something, tell yourself fibers, blood, hair, human cell etc .- uniquely linking the author with the crime. We may be talking about microscopic cells, particles belonging to useful, remains minimal, in short, that, if absent, may be due to two main causes: 1. Lack of instrumental be able to detect (in addition to the cells or microscopic traces) the fingerprints that are based on clothing, in porous media and even the own skin.
2. The lack of preparation or inexperience of the researcher.
Assuming we have good resources and expertise to scrutinize a crime scene with guaranteed success, what happens when it is blurred or polluted by all professionals who come before the forensic specialists to perform activities their field of specialization? Of course, in this protocol seems that quite clearly referring to a theoretical concept that costs no little effort to implement it.
is coordination. But let's face it, sometimes when commits a crime of some social alarm, sexual assault, manslaughter, murder ... - coordination of which we speak, at least in the early stages of fact, it is difficult to make it effective. Starting your own circle of people who interact primarily with the aggressor or the victim, which do not have to coordinate or lack that makes them curious, continuing for-that there are hundreds, "according to media services health, judicial commission ..., finishing with members of the Security Forces and, within them, which integrates the various specializations. Total, which when produces an event in which, for example, there is a significant amount of blood scattered here and there, the scene can become a chapazal with a pilgrimage included. Logically, this implies a significant decline in the quality to be achieved when carrying out visual inspection Police Force. Therefore, it is essential that police officers who arrive first at the scene, take a number of protective measures aimed at comprehensive protection of the place, also avoiding the interference of unauthorized persons. Consider that the crime scene and its circumstances is one of the few sources where the author leaves his business card, so that we can relate to the fact authorship. 
We have excellent kits with reagents, sample collection kits, brushes, cameras and forensic light, but if we need to collect hair from the back of the hand of the victim is his neighbor, the butt of ashtray left the police, the coroner or the judge himself or lofoscópicas traces found in the telephone handset is the physician of 112 ... that coordination we talking about? Yes, we will come one after the other or maybe all at once, each will have carried out their work with exquisite professionalism. Nothing to say, but coordination have to admit that extra professionalism to do my work thinking that will come later, and that means do not contaminate the evidence disappear, preserving as far as possible what I am. Simple: A priori, placed a few simple latex gloves, a pair of breeches or avoid unnecessary trace is synonymous with quality. That's what we mean when well managed human resources and materials, when jobs are done by specialized personnel who are subject to ongoing training and updated. When the action protocols fit as possible to the cases that may occur because its flexibility allows it to fit within reasonably certain imponderables. Also the famous chain of custody is a fact of quality. This guarantees the identity and integrity of the remains or samples may be a source of evidence in a criminal act. Its adaptation, from the first moment she appears on stage, is the best guarantee of success in the process as a climax: the recreation of the test with total asepsis at the hearing.
Who knows, but maybe Locard, consciously or not, as had the "intruders crime scene" when he made his other axiom that "there is no perfect crime but badly researched" .
Author: Roberto Fernández Carro
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