Final Flashcards
People may have knowledge about…
a crime or a perpetrator and not even know it
The police have to use strategies like tip lines, television shows, and special alerts to…
identify and obtain information from these individuals who may have knowledge about a crime or a perpetrator and not even know it
Tip lines are…
an easy and convenient way for citizens to share information with the police through the use of a telephone or the internet
Crime Stoppers offer
cash rewards for information leading to an individual’s arrest
Television shows like America’s Most Wanted disseminate…
information about unsolved crimes with the intention that the public will have information regarding the crimes and contact the authorities (Many times these cases have a description of the perpetrator)
AMBER (America’s Missing: Broadcast Emergency Response) was created to…
Disseminate information about child abduction to enlist the public’s help in locating the child quickly and safely
To broadcast an AMBER Alert, investigators need:
A confirmation that there has been a child abduction,
There is reason to believe that the child is in danger and that there is enough reliable information about the facts of the case
The theory is the children abducted by strangers are…
harmed quickly (within the first three hours)
Amber Alerts are designed for stranger abductions, which are…
rare
Most Amber Alerts result in a child recovery, but the…
AMBER Alert had nothing to do with the recovery
AMBER Alert involving a stranger abduction is…
less likely to result in the recovery of the child
Where there is a child recovery, only…
17% was within six hours of the abduction
National Center for Missing and Exploited Children (NCMEC) send…
“Have you seen me?” mailings
Individual police agencies have “most wanted” lists through…
crime alerts, media, billboards, and “FaceCrook” (a computer application available to inmates)
These strategies for Information Disseminating have limitations
Information can be overwhelming
False Information
How to distribute reward money fairly?
Credibility and motivation of citizens contributing information
The publicity of the case may affect a witness’ perceptions
Should money be paid for someone performing what is arguably someone’s civic duty?
Confidential informants are
those who actively assist law enforcement in an ongoing capacity (Controversial and Considered a necessary evil)
Four types of informants
The hammered informant is coerced by the police
The mercenary informant is motivated by money
The vengeful informant is motivated by revenge
The police buff informant is a fan of the police
Gang members are disproportionately involved in
crime, therefore they are constantly a problem for law enforcement.
Law enforcement has developed gang task forces as a
response to the increasing issue of gangs
What criteria characterizes a gang?
Three or more members
Share an identity
View themselves as a gang and are recognized by others as one
Has a level or permanence and some organization
Involved in a high level of criminal activity
Gang member identification is through
name, colors or symbols, graffiti, tattoos, clothing, and hand symbols
Crime analysis involves the collection and
analysis of data pertaining to a criminal incident, offender, and target.
Crime analysis can inform patrol allocation decisions and make
predictions of future occurrences for preventative purposes.
Crime analysis is based on the idea that crime is
a non-random phenomenon
The use of GIS and COMPSTAT help
the police identify patterns to develop policing strategies
ViCAP(Violent Criminal Apprehension Program) is a
a national computer database system that is operated by the FBI to identify the MO or signature aspects of crimes for the purpose of identifying crimes that are committed by the same person
Three types of crimes are focused on
Solving or unsolved homicides or attempted homicides
Missing persons where foul play was suspected
Unidentified bodies where the cause of death was suspected to be homicide
ViCAP is used to overcome linkage blindness on behalf of law enforcement who are unable to identify
serial crimes due to jurisdictional boundaries
Limitations ViCAP of include
ViCAP is not effective when the MO is not similar or there is missing information
ViCAP has little to do with solving crimes
Crimes have to be in the database in order to be useful
Intradepartmental databases are operated by individual
Law enforcement agencies for their own investigators’ use.
Interdepartmental agencies share information across law enforcement agencies
NCIC: the largest crime information network in the U.S.
NLETS: (JANET-PA) Network that links law enforcement with a motor vehicle and licensing departments
ICTS
CIS
Sentry
Equifax
Facebook, Twitter, Craigslist
Investigators can find information
YouTube (VARIOUS OTHERS)
Many people post videos of them partaking in illegal activities
All death can be classified in one of four ways (the manner of death)
Natural causes (the most common)
Accidents
Suicides
Homicides
In determining the manner of death, investigators must consider
The cause of death
The characteristics of the decedent
The circumstances of the death
Indicators of Suicide
The presence of a weapon
Wounds that could have been self-inflicted
A lack of defensive wounds
The presence of a suicidal motive
Offensive/Defense Wound
Knife slash on criminal
Bruises on the ribs, back
Autoerotic deaths- Deaths usually involve a…
solo sexual activity went wrong, where the individual dies as a result of asphyxia
Indicators of this accidental death(Autoerotic death)
The arrangement of a self-rescue system Evidence of solo sexual activity Evidence of sexual fantasy aids Evidence of the prior autoerotic presence No apparent suicidal attempt
Patterns are…
Characteristics of Homicides
Murder can be defined as
the willful killing of one person by another
- Most victims and perpetrators share the same characteristics
- Least committed crime, relatively infrequent
- Most often, homicides occur as a result of an argument of the commission of another felony (felony murders)
- Most victims and perpetrators know each other prior to the incident
- Firearms are the most commonly used weapon
- Highest clearest rate
Death investigations usually begin…
where the body was found
Three basic questions that need to be answered in a death investigation
Who is the decedent?
What was the cause of death?
Who committed the murder?
Witnesses, relatives, and friends may be present to…
inform investigators of this (Who is the decedent?)
A person’s possessions can…
also, identify a victim
Scientific methods like DNA, fingerprints and anthropological facial reconstruction may…
help identify the decedent as well
Gunshot wounds as a result of firearms
Shell casing, the presence of entrance and exit wounds, the distance of the gun from the body (contact, close, distant), the amount of trauma sustained, the location of the trauma, and gunshot residue are important features in firearm deaths
Cutting wounds involve
the slicing of tissue with smooth edges
Stab and puncture wounds will
present holes in the tissue
Blunt force trauma is characterized by
irregular or rough-edged laceration, bruising, and broken bones
Poisoning most often occurs
accidentally but can be as a result of a suicide
Asphyxia is when
a person is unable to breathe due to any action or material, Petechial hemorrhaging
Asphyxia can occur in form of manual strangulation (with hands)
ligature strangulation (such as a rope), hanging, suffocation (smothering), or drowning
Drug overdoses are often about
determining who supplied the drugs to the victim
Drugs can be introduced into the body intravenously…
intramuscularly, orally, rectal/vaginally, through inhalation, subcutaneously, and sublingually
Death via fire
is challenging
Most often fire deaths are a result of
smoke inhalation, not from the fire itself
To identify perpetrators
- Circumstances of the incident and characteristics of the victim can be crucial
- Establishing a motive
- Physical evidence on the victim’s body or at the crime scene
- Establishing the time of death can be essential for it can be compared to a suspect’s alibi
The postmortem interval (PMI) guesses the…
Time of death through the changes a body goes through after death
- Potassium levels in the vitreous humor
- Contents of the victim’s gastrointestinal tract
- The degree of decomposition
- Insect and animal activity
Algor mortis refers to the
the cooling process of the body - loss of heat by a body
Liver Mortis (postmortem lividity) refers to
the blood pooling of the body
Rigor mortis refers to
the rigidity of the body
An insect’s presence, stage of…
development and contents of their gut are particularly useful
Information from an autopsy is useful in
determining the cause and manner of death
An autopsy consists of two parts:
The external examination consists of the opening of the chest, abdominal cavity, pelvic cavity, and the skull
Investigating homicides that are suspected as being a part of a series…
appear as random and lack a traditional motive. This makes them difficult to solve
Serial killers are mobile…
and they plan well in advance
Several law enforcement agencies may be involved which complicate the investigation
VICAP
Task forces are often developed to address this issue
Homicides with certain characteristics are more likely to be solved within
24 hours. If a case does not have those characteristics, it may not be solved
Some cases get pushed aside due to
caseload and time pressures
Cold case investigations provide new eyes
on old cases
There are three types of cold cases
- Cases that are reopened due to outside pressure
- Cases that are reopened due to the availability of previously untested evidence- DNA
- Cases that are reopened when a person confesses or a witness comes forward
Cold cases are difficult to solve because investigators often face
Uncooperative witnesses
Difficulty locating witnesses
Decrease suspects
DNA results that do not lead anywhere
Cold cases are more likely to be solved if:
It is a recent crime
It did not involve drugs
The victim was found in a private residence
The victim was a young male
There was a known motivation for the crime
A prime suspect had earlier been identified
Forcible rape refers to
the penetration of the vagina or anus with a body part or object, or oral penetration by a sex organ of another person without the consent of the victim (UCR), most are planned
It’s not about the sex
it’s about the power and control
(Sexual Assult) Victims are
young female typically
(Sexual Assult) Offenders are usually
white, adult males
(Sexual Assult) A majority of sexual assaults occur between
people who know each other
(Sexual Assult) The most important investigative information comes from the…
victim, either through interviews or through forensic medical examination of the victim
Sexual assault is the most…
traumatic type of criminal victimization
(Sexual Assult) Victims tend to have a wide variety of emotions and behaviors and should be approached
carefully and considerately as a result
Large number of sexual assaults go
unreported
(Sexual Assult) First responders should:
Be continually supportive of the victim
Approach victims calmly
Interview victims with extreme sensitivity
Minimize the amount of times a victim has to share their story
Ask the victim whether they prefer a male or female officer conduct the interview
Have only one officer assigned to the interviews
Remember that it is normal for the victim to forget, or want to forget, the incident
Encourage the victims to get medical treatment
Encourage the victims to obtain counseling
(Sexual Assult) Interviewing the victim should:
Be minimized as much as possible
Have only one officer conduct all interviews
Should not be conducted like an interrogation (cognitive process)
Involve the victim as much as possible
Be responsive and receptive
Give some control to the victim
Consist of mostly listening
Be conducted with professional language
Obtain a healthy balance of difficult questions and ones that understand what the victim is going through
Focus on the violence of the incident, not the sexuality of the crime
Show sensitivity in obtaining detailed information
Conclude with informing the victim of what to expect next
The victim and perpetrator know each other
Document injuries, the use of a weapon, the circumstances of the crime, and the age of the victim
(Sexual Assult) The victim and the perpetrator do not know each other but the victim has
described the perpetrator
(Sexual Assult) The perpetrator was a stranger and the victim was unable to provide a
sufficient description
(Sexual Assult) In these situations, it is important that the investigators ask question regarding the MO or
signature of the perpetrator as well as the nature of circumstances of the attack
(Sexual Assult) Physical evidence can confirm and identify a
perpetrator and establish the elements of the crime
In a sexual assault, the victim’s body is considered a crime scene for SANEs
(Sexual Assault Nurse Examiners) to document injuries and recover evidence
(Sexual Assult) Physical evidence may also be present at the actual
crime scene as well