The ability of investigators to collect certain evidence may also be limited if, by collecting one type of evidence, they must compromise another. For example, swabbing a knife found near the victim at a murder scene for blood or DNA could potentially destroy latent fingerprints present on the knife.
What are the limitations of forensic science?
Retrospective review of cases when problems in forensic science are identified.
- Unreliable or invalid forensic discipline. …
- Insufficient validation of a method. …
- Misleading testimony. …
- Like everyone, forensic practitioners can make mistakes, including mixing up samples or contaminating specimens.
What are the legal challenges of a crime scene search?
The major legal challenge that is faced during a crime scene search is whether a search warrant is needed to remain at the crime scene after the original response ofthe law enforcement officers.
What are the limitations of crime scene photography?
PHOTOS are limited TO RECORD CRIME SCENES LACK DEPTH FAIL TO PROVIDE ACCURATE REPRESENTATION OF DISTANCES BETWEEN ITEMS OF EVIDENCE CAMERA ANGLE.
What is the most challenging aspect of processing a crime scene?
All evidence within the physical environment of the crime scene is critically important to the investigative process. At any crime scene, the two greatest challenges to the physical evidence are contamination and loss of continuity.
What are the pros and cons of forensic science?
While one of the pros of forensic science is that the career often brings significant professional satisfaction, a con lies in how it can also take a personal and emotional toll, sometimes requiring working under less than ideal circumstances.
What are some problems with forensic evidence?
For example, forensic testimonies can be misleading. There have been cases where results were fabricated or where evidence that would have led to a guilty conviction were concealed. Innocent mistakes can happen, too. Practitioners can sometimes confuse or contaminate samples.
When securing a crime scene the two most important factors are?
The two critical factors most likely to change the crime scene are people and the weather.
Who secures a crime scene?
Police officers are typically the first to arrive at a crime scene. They arrest the perpetrator if he’s still there and call for an ambulance if necessary. They are responsible for securing the scene so no evidence is destroyed. The CSI unit documents the crime scene in detail and collects any physical evidence.
Why must the first consideration in crime scene investigations be the legal implications of evidence collection?
Why must the first consideration in crime scene investigations be the legal implications of evidence collection? … To prevent contamination that can occur at any time after a crime, evidence collection should be done in a timely manner.
What is the most important rule for a crime scene photographer?
Photographing the evidence: Photographs should be taken directly at right angles, eliminating probable distance distortions for clear visualization and each part of evidence should be photographed with scale to signify size and without scale to show relationship with overall scene.
What makes a photograph accurate in a crime scene?
Depth of field is the amount of area in front of (foreground) and behind (background) an object that remains in focus. Lastly, white balance allows the camera to record the proper temperature of light, resulting in an accurate representation of the color tones of objects in the photograph.
What are the 3 types of photographs that need to be taken at a crime scene?
To accomplish this, all crime scene photography consists of three basic types of photographs: overall, mid-range, and close-up.
What are the 3 phases of criminal investigation?
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.
What are the 5 steps of crime scene investigation?
INTERVIEW, EXAMINE, PHOTOGRAPH, SKETCH and PROCESS.
What is the most difficult evidence to collect?
The type of evidence that would be most difficult to collect would be trace evidence such as fibers, hair, or specs of dirt. Special vacuums and other specialized tools such as tweezers are needed to carry out the collection of trace evidence. Trace evidence is often small and hard to find/collect.