police procedure and investigation pdf

Police Procedure And Investigation Pdf

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Comprehensive instructions from first responding Officer to crime scene preservation, documentation, interviews and interrogation plus Canadian legal aspects. Comprehensiveness rating: 5 see less. Text is based on Canadian Charter of Rights and Freedoms, so legal aspects are not likely to drastically change.

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Prosecutorial Investigations

The first police crime laboratory was established in in Lyon, France , by Edmond Locard. That principle gave rise to the forensic sciences, which are the accumulated methods for developing and analyzing physical evidence from crime scenes.

Crime-scene investigation, which is often performed by experts known as crime-scene investigators CSIs , involves the careful gathering of such evidence, which is then analyzed at a crime laboratory. In some cases evidence gathered by CSIs and analyzed by forensic experts is the only incontrovertible evidence presented at trial. Because there is rarely more than one opportunity to obtain evidence from a crime scene, the investigation by the CSIs must be methodical and complete.

They also take samples of fibres, dirt, and dust. After a preliminary search, the crime scene is photographed; some police departments also make a videotape of the scene. CSIs take careful measurements, make detailed notes, and draw sketches. Evidence is collected and carefully catalogued. Scientific and technological advances have resulted in the development of laser and alternative-light sources that can reveal latent fingerprints, stains, hairs, fibres, and other trace evidence.

For example, luminol, a substance that fluoresces when in contact with blood, is capable of detecting blood traces that have been diluted up to 10, times, making it useful for searching crime scenes that were cleaned in order to conceal evidence. In addition, the patterns of blood stains often indicate many of the dynamics of the crime; investigators trained in blood-pattern analysis, for example, can determine whether a victim was standing still, walking, or running at the time of death.

Although some larger police departments have specialists to take photographs and fingerprints and to collect trace evidence, most CSIs are generalists who are trained to perform all these tasks. Although a single hair or fibre cannot place a suspect at a crime scene, collections of hair or fibre can be used to establish with a high degree of probability that the suspect is connected to the crime. Hairs possess class characteristics patterns that naturally occur in specific percentages of the population that indicate some general features of the individual from whom they are obtained, such as what diseases he may have and sometimes what race he belongs to.

If the hair has any follicular material or blood on it, a DNA test can determine with a certain degree of probability whether the sample came from a particular individual. Toxicology was first systematized by the Spanish physician Matthieu Orfila — Toxicological reports can assist investigators by showing whether the drug ingested was fatal and the approximate time the drug was introduced into the body.

Serology is the study of serums such as blood and other human fluids. In Karl Landsteiner , a researcher at the University of Vienna , published his discovery that human blood could be grouped into distinct types, which became known as the ABO blood group system. In the Italian scientist Leone Lattes developed a simple method for determining the blood type of a dried bloodstain. The Rh blood group system , which classifies blood according to the presence or absence of the Rh antigen , was developed in — Since that time more than different blood factors have been discovered.

Because those factors appear unevenly in the population , they can be used to identify the particular groups to which potential suspects belong.

As various blood factors are defined in a sample, the percentage of people who have that combination of factors is narrowed, and the sample becomes more individualized. The introduction into forensics of DNA analysis has enabled investigators to detect identifying characteristics of body fluids and cells with unprecedented precision, making them better able to implicate or eliminate potential suspects.

Document examiners employ a variety of technologies and techniques. Handwriting analysis, for example, is based on the premise that, by the time people become adults, their writing has acquired peculiarities that may be used to identify them.

A forged signature presents other problems. In many cases such simulations can be identified. Two individuals making careful tracings of the same signature can produce virtually identical drawings. In the era before computers, investigators would sometimes examine typewriters to determine the make and model used to prepare a document. Ink comparisons provided evidence that was frequently of value.

Chemical tests of various kinds are used for ink comparisons. Papers can be differentiated on the basis of fibre, filler, and sizing constituents. Fibres can be identified by differential staining and microscopic examination. Fillers can be distinguished by X-ray diffraction because they are crystalline substances. Chemical tests are used for the identification of sizing constituents.

Through chemical analysis it is even possible to identify paper by batches. Firearms identification was developed in the s by American ballistics expert Calvin Goddard, who first applied his new technique to help solve the St.

Each firearm leaves individual markings on a bullet and case when it is fired. Such markings can be used to determine whether evidentiary bullets were fired from a suspect weapon. Similar techniques are applied to marks left behind at crime scenes by pry bars, screwdrivers, and other tools.

Police use organic and inorganic analysis to examine the chemical composition of trace evidence found at a crime scene, which may then be matched to substances associated with a suspect. Organic analysis, which is performed on substances containing carbon atoms, involves various techniques, including chromatography , spectrophotometry , and mass spectrometry.

Inorganic analysis, which is performed on all substances that do not contain carbon, employs spectrophotometry, neutron-activation analysis a technique involving chemical analysis by radioactivity , and X-ray diffraction , among other techniques. Various other life and physical sciences are used to assist police investigations. Specialists approach the problem from different scientific perspectives, and the results of their investigations can provide police with a wealth of information about a case.

Forensic pathology is a specialty within the field of medical pathology. Forensic anthropology is primarily concerned with the identification of human skeletal remains. Forensic anthropologists can differentiate animal remains from those of humans and, given the proper bones, can determine the gender and in some cases the race of the victim. Facial reconstruction combines both art and science. A skull can be used as a foundation and the face reconstructed with clay.

By using charts of specific points of skin and tissue thickness, scientists can produce a relatively unique face that can then be used to help identify the decedent. Forensic entomology is another field that assists police in determining time of death. Insects infest a corpse at a very predictable rate. Certain insects immediately invade the body to feed or to lay eggs, while others will not approach the body until it has reached a more advanced stage of decomposition.

Thus, the types of insects or eggs present in a corpse indicate how long the victim has been dead. A forensic entomologist also can assist in determining where packages or cargo originated if insects or eggs are found in the shipment. Forensic odontologists examine teeth and bite marks. They also may tie a suspect to a crime by comparing a bite mark taken from the crime scene with dental casts taken from the suspect.

Forensic botanists examine plants and plant matter to determine their species and origin. In some cases suspects may leave behind plant parts, spores, or seeds that had adhered to their clothing. If the plant species in question is found only in limited areas, its presence at the crime scene may indicate where suspects have been or where they live.

Forensic botanists also can be essential in locating clandestine gardens or greenhouses used to cultivate such illegal plants as marijuana.

Forensic engineers perform accident reconstructions and failure analyses of vehicles and structures. The science of forensic engineering was instrumental in understanding the physical dynamics of the Oklahoma City bombing in and in explaining the collapse of the twin towers of the World Trade Center in the September 11 attacks of Forensic engineering also is useful in police investigations of motor-vehicle accidents.

Forensic art or illustration is used for reconstructing crime or accident scenes. Artists can produce sketches of suspects from the recollections of victims or witnesses; they also can produce illustrations to assist prosecutors in court. An increasingly used technique involves illustrating the step-by-step development of accidents or crimes by means of computer-generated animations.

As the use of computers and the Internet in all types of activities grew rapidly in the late 20th century, forensic computing became an important field for investigating cybercrimes , including crimes involving computer hacking the illegal entry into and use of a computer network and the programming and distribution of malicious computer viruses.

In many cases personal computers are confiscated at crime scenes or pursuant to warrants. Police may require the assistance of a computer expert to break any password protections or to unlock encrypted files to reveal evidence of criminal activity. Identifying pedophiles or cyberstalkers people who engage in stalking by means of computers sometimes requires police to seek the cooperation of Internet service providers, which maintain records such as Internet protocol addresses that may indicate the particular computer network used by the suspect.

Police Article Media Additional Info. Article Contents. Load Previous Page. Crime-scene investigation and forensic sciences. A simulated crime scene is a teaching tool in a university forensic chemistry program. Metropolitan Police Department officers in Tokyo investigating a crime scene.

Forensic anthropologist examining a human skull found in a mass grave in Bosnia and Herzegovina, Load Next Page.

Prosecutorial Investigation, Regional Criminal Procedure Legislation and Experiences in Application

This monograph by a group of authors under the title Prosecutorial Investigation — regional criminal procedure legislation and experiences in application, which is issued by the OSCE Mission to Serbia, addresses one of the most current issues relating to the process of the reform of criminal procedure laws, not only of the countries in the region Serbia, BiH, Croatia, Macedonia, Slovenia, and Montenegro , but in a much wider context. Prosecutorial investigation. Notions Fondamentales de Droit — Manuel du Formateur. State and non-state perceptions of Security. Gender Jurisprudence. Strengthening Prosecutorial Accountability in South Africa. Civil-military Relations in Europe.

Interim Guidance Regarding Marijuana Decriminalization This document provides guidance to law enforcement officers regarding new enforcement requirements pursuant to the marijuana decriminalization law. Executive Order No. Less-Lethal Ammunition. Free PDF Reader. Guidelines I Directives.

Skip to content. Criminal Justice. Copyright by the American Bar Association. This work Criminal Justice Standards may be used for non-profit educational and training purposes and legal reform legislative, judicial, and executive without written permission but with a citation to this source. A prosecutor's investigative role, responsibilities and potential liability are different from the prosecutor's role and responsibilities as a courtroom advocate. These Standards are intended as a guide to conduct for a prosecutor actively engaged in a criminal investigation or performing a legally mandated investigative responsibility, e. These Standards are intended to supplement the Prosecution Function Standards, not to supplant them.


Jurisdictions will want to carefully consider the procedures in this guide and their ciation of Chiefs of Police, National Sheriffs' Association, International.


Criminal investigation

An investigation refers to the process of collecting information in order to reach some goal; for example, collecting information about the reliability and performance of a vehicle prior to purchase in order to enhance the likelihood of buying a good car. Applied to the criminal realm, a criminal investigation refers to the process of collecting information or evidence about a crime in order to: 1 determine if a crime has been committed; 2 identify the perpetrator; 3 apprehend the perpetrator; and 4 provide evidence to support a conviction in court. If the first three objectives are successfully attained, then the crime can be said to be solved.

Police: Criminal Investigations

Criminal investigation

The first police crime laboratory was established in in Lyon, France , by Edmond Locard. That principle gave rise to the forensic sciences, which are the accumulated methods for developing and analyzing physical evidence from crime scenes. Crime-scene investigation, which is often performed by experts known as crime-scene investigators CSIs , involves the careful gathering of such evidence, which is then analyzed at a crime laboratory. In some cases evidence gathered by CSIs and analyzed by forensic experts is the only incontrovertible evidence presented at trial.

The forms for use with the Criminal Procedure Rules collect information required by the court for the purposes of criminal case management under the Rules and under other legislation. Each form identifies the Criminal Procedure Rule and any other legislation that the court must apply: see the Rules and that other legislation for details. The information that you give the court will be shared as the law requires, for example with the other parties to the case and you may be required by the Rules and other legislation to give them that information yourself, for example by sending them a copy of the form: see the forms and Rules for instructions. The information that you give the court will not be shared with anyone else or used for any purpose other than the purposes of the case unless that is allowed by law.

Criminal investigation is an applied science that involves the study of facts that are then used to inform criminal trials. A complete criminal investigation can include searching , interviews , interrogations , evidence collection and preservation, and various methods of investigation. Criminal investigation is an ancient science that may have roots as far back as c. In the code, it is suggested that both the accuser and the accused had the right to present evidence they collected. Private investigators are also commonly hired to complete or assist in criminal investigations. An early recorded professional criminal investigator was the English constable. Around CE, it was recorded that the constable was to "


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Introduction to Criminal Investigation: Processes, Practices and Thinking

1 comments

Hugues L.

To describe, on a national scale, current investigative organization and practices. To assess the contribution that police investigation makes to the achieve- ment​.

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