Police Investigation
The site where the offence took place.
What is the crime scene.
The most common body substance found at a crime scene.
What is human blood.
Are suspects typically questioned before, or after physical evidence has been collected?
After.
A written log of what an officer has witnessed.
What is a police log.
When is a search warrant not needed to arrest a suspect? (1 reason)
-suspect the person has, or is about to commit an indictable offence
-a person is in the act of committing a criminal offence
First task performed by police when officers arrive at a scene.
What is call an ambulance and assist injured people.
Which type of evidence carries more weight in a court of law: physical evidence or witness testimony.
Explain why.
Physical evidence because witnesses have poor memories. Physical evidence can provide indisputable facts.
What is the purpose of interviewing a suspect?
To find the truth.
The written record of all the people who had control over evidence.
What is the chain of custody.
Is the following an example of class characteristic or individual characteristic of an impression:
A Goodrich tire, 12-inch, steel belted radial, year 2000
What is a class characteristic.
(general attributes of an object)
To protect themselves and others, what must police assume when they arrive at a crime scene?
That the perpetrators are present and armed.
One of the most frequent tools used to commit a crime.
What are hammers, screwdrivers, crowbars?
(only 1 needed in answer)
Police must follow legal procedures when speaking to a suspect. List one thing that police must be careful to do when interviewing a suspect?
1. Suspect must be informed of their right to an attorney.
2. Police may NOT use force to get testimony.
3. Suspects have a right to remain silent when questioned by the police.
To deprive someone of liberty by seizing or touching the person to indicate that s/he is in custody.
What is arrest.
Is the following a class characteristic or individual characteristic of an impression:
Striation marks on a fired bullet
What is individual characteristic.
(uniquely identifiable to a specific source)
The two boundaries that police establish around a crime scene. Name both.
What are:
centre - the area where the offence was actually committed
perimeter - the areas surrounding the centre where the offender may have been or may have left evidence.
The science of analysing evidence in a criminal investigation using biochemical and other scientific techniques. (name the science)
What is forensic science?
During interrogations, police try to establish a trusting relationship. What kind of questioning do police use in the beginning of questioning?
Open-ended questions that are non-threatening.
Example: "Tell me what happened".
Specific questions follow later, like "What time did you leave work?" Police can compare the answers.
A court document that gives the police the right to search a specific location.
What is a search warrant?
Why is DNA evidence so valuable to investigators?
Because DNA is unique to each person. If a suspect's DNA matches DNA from a crime scene then it can be concluded that the two samples came from the same person. DNA can place a person at a crime scene.
DOUBLE JEOPARDY
place a wager
Contaminated evidence is when physical evidence is lost, destroyed, or altered. Explain how a piece of evidence could become contaminated (you can't say lost, destroyed, altered).
3 types of impressions that can be found at a crime scene.
What are:
fingerprints
gloves
shoe prints
tire tracks
(3 needed in answer)
During an arrest, how does an officer show that a person is in legal custody?
By touching the accused.
Define 'reasonable grounds'
Officers must have some proof in order to arrest someone. 'Reasonable grounds' is information that leads them to conclude that the suspect committed a crime.
A citizen's arrest is when any person arrests someone who they believe has committed a crime. Why are citizen's arrests rare?
Because many people are afraid of being sued or injured.