Methods of criminal investigation evidence


Lecture VIII-IX

Witness and Evidence

GatheringMethods of Criminal Investigation Lecture VIII-IX Witness and Evidence Gathering Information about Witness An investigation usually contemplates evidence gathered from crime scenes and from witnesses. As such, witnesses are an integral part of any investigation. Witnesses can range from persons who observed a crime occur and can identify the suspect, to witnesses who have no direct connection to the crime but are able to provide some indirect evidence that will form part of the overall evidentiary package that the investigator will use to gain a full understanding of the crime. Evidence such as this one may include work records or other archival data to which the witness has access. All witnesses shall be managed during the initial investigation when officers arrive on scene: During Initial investigation During the follow up of the investigation, Post-investigation for the court appearances. In numerous cases, involved witnesses need to be managed for a variety of reasons. Witnesses that are vulnerable, such as homeless people, need to be made available for court, so a witness management program is required to keep the witnesses available for Court. Witnesses who are in danger due to their lifestyles or threats also need to be given access to healthcare and security or other programs that may make them more likely to be of assistance to the court when they are called to give evidence in a safe environment. Different types of witnesses can provide evidence from different perspectives, and these perspectives need to be assessed by the investigator to establish the reliability of the evidence provided. For any investigation, the details of events provided by witnesses are a critical element of the evidence gathered. Witness testimony is the verbal account of events or knowledge of the facts relevant to the crime. Witness statements will assist the investigator in forming reasonable grounds to lay a charge and will assist the court in reaching a decision that the charge against an accused person has been proved beyond a reasonable doubt. As the law has evolved regarding witnesses, many rules of evidence, definitions, and protocols have developed to govern the way witnesses may testify in court. It is important for an investigator to understand these elements as this allows an investigator to evaluate witnesses and collect witness evidence that will be acceptable to the courts. Identifying witnesses Defining witness types Defining competence and compellability Identifying the witness/suspect dilemma Witness credibility assessment The truthfully-incorrect witness Recognizing dominant witness influences and conformity Dealing with uncooperative witnesses Conducting witness interviews The field interview Independent Witness In addition to considering the evidence of a witness based on being an eyewitness or a corroborative witness, the court will also give additional weight to evidence that comes from a person who is an independent witness. An independent witness is sometimes referred to as a third-party witness. They are characterized as independent because; They are not associated with the victim They are not associated with the suspect They are not in any way associated to the criminal event Independent Witness In other words, an independent witness is someone with nothing to lose and nothing to gain by the outcome of the case. With this inferred lack of vested interest to either side, the independent witness is seen by the court as providing unbiased testimony. Similar to the court, an investigator can attribute more confidence to statements made by persons who are established to be independent eyewitnesses or independent corroborative-witnesses to an event. Evidence in Pakistan by a witness In the Laws of evidence, a witness is a person who has seen a matter (that is under legal scrutiny) or who has personal knowledge of the facts of a case and can provide information about what they saw, heard, or experienced. Witnesses play a crucial role, whether it’s a nikah, a court case (either criminal or civil cases), or an investigation. They are typically called upon to provide information upon the initiation of an FIR or to testify in court. In the laws of evidence, the testimony provided by a witness can be used to establish the facts of a case, to prove or disprove allegations, and to help determine the guilt or innocence of a defendant. Oral Evidence: This includes any spoken statements made by a witness or party to a case. It may include testimony given in court or statements made outside of court that are relevant to the case. Documentary evidence: This is considered any evidence which can be provided in written document form i.e an application to the court, a contract etc. Conclusive Evidence: This is evidence that is considered to be irrefutable, and cannot be contradicted or disputed. Direct Evidence: This is evidence that directly proves a fact, without the need for inference or interpretation. Real Evidence: This includes any physical evidence that is relevant to the case, such as weapons, clothing, or other items that were collected from a crime scene. Extrinsic Evidence: This includes any evidence that is introduced from outside of the case, such as prior convictions or other legal documents that are not directly related to the current case. Incriminating Evidence: Evidence that incriminates an individual by clearly identifying the perpetrator and their involvement in the crime Indirect Evidence: This includes any evidence that implies a fact, without directly proving it. Original Evidence: This is evidence that is considered to be the original or primary source of information, such as a signed contract or a video recording of an event. Derivative Evidence: This is evidence that is created from an original source, such as a photocopy of a document. Parole Evidence: This includes any evidence that is related to the negotiations or discussions leading up to the formation of a contract. • Prima Facie: This is evidence that is sufficient to establish a fact or case unless it is contradicted or disproved by other evidence. • Primary Evidence: This is evidence that is considered to be the best evidence available, such as an original document or a witness who directly observed an event. • Secondary Evidence: This includes any evidence that is not the best or most reliable source of information. • Tertiary Evidence: This is based on secondary evidence that is further removed from the original source of information. For example, a witness testifying about the contents of a contract based on their recollection of a conversation with one of the parties would be considered tertiary evidence. Tertiary evidence is generally considered less reliable than primary or secondary evidence and may not be admissible in court without additional verification or corroboration. Scientific Evidence: This includes any evidence that is based on scientific analysis, such as Chemical Analysis testing, or ballistics analysis. Electronic Evidence: This includes any evidence that is stored in electronic forms, such as emails, text messages, WhatsApp messages, CDR, or digital photos. Forensic Evidence: Forensic evidence includes scientific evidence such as DNA analysis, ballistics, and toxicology reports. This type of evidence is often used to establish a link between a suspect and a crime scene or to prove or disprove a particular theory of the case. Expert Evidence: Expert evidence is provided by an expert witness, who is often called upon to explain complex technical or scientific concepts to the court in a way that is easily understandable to the judge. Demonstrative Evidence: This includes any visual aids used in a case, such as photographs, maps, charts, or diagrams. These aids help to clarify complex information and make it easier for the judge to understand. Testimonial Evidence: This includes any statements made by witnesses, both in and out of court. Witnesses may be asked to testify under oath and provide information about their observations or experiences related to the case. Circumstantial Evidence: This includes any indirect evidence that implies a fact, without directly proving it. For example, if a suspect is seen running away from the scene of a crime(i.e. animal cruelty), this may be circumstantial evidence that suggests they were involved. Hearsay Evidence: This includes any statements made by a person who is not present in court and cannot be cross-examined. Hearsay evidence is generally not admissible in court unless it falls under certain exceptions. CCTV Evidence: CCTV evidence is evidence collected from cameras that are stationed to monitor premises. These can be challenged, but prove to be valuable. Confession: A Confession is a statement made directly before a court or adjudicating individual by a person about something they themselves have done. Police confessions in Pakistan are usually not considered if the individual claims they made it due to police brutality. Medical Evidence: This is evidence that is usually supplied with a medical report i.e. in cases of drug abuse or a second opinion in a medical negligence case. Physical evidence, such as fingerprints, DNA samples, and other forensic evidence, is also commonly used in criminal cases in Pakistan. This type of evidence can be used to establish the identity of a suspect, to link a suspect to a crime scene, or to disprove alibis. Handwriting Analysis: In cases where the identity of a writer, or signatory (i.e. in matters of a signature in a cheque fraud case) a handwriting expert’s report would be considered evidence. Geographical Evidence: Evidence that can prove the whereabouts of an individual or an item. For example, in cybercrime cases, a laptop can be traced by its IP Address. Evidence related to Movement: Any evidence that can prove the movement of an individual or item, i.e. a delivery receipt or a flight record. Information about Witness

An investigation usually contemplates evidence gathered from crime scenes and from witnesses. As such, witnesses are an integral part of any investigation. Witnesses can range from persons who observed a crime occur and can identify the suspect, to witnesses who have no direct connection to the crime but are able to provide some indirect evidence that will form part of the overall evidentiary package that the investigator will use to gain a full understanding of the crime. Evidence such as this one may include work records or other archival data to which the witness has access.

All witnesses shall be managed during the initial investigation when officers arrive on scene:

During Initial investigation

During the follow up of the investigation,

Post-investigation for the court appearances.


In numerous cases, involved witnesses need to be managed for a variety of reasons.

Witnesses that are vulnerable, such as homeless people, need to be made available for court, so a witness management program is required to keep the witnesses available for Court.

Witnesses who are in danger due to their lifestyles or threats also need to be given access to healthcare and security or other programs that may make them more likely to be of assistance to the court when they are called to give evidence in a safe environment.

Different types of witnesses can provide evidence from different perspectives, and these perspectives need to be assessed by the investigator to establish the reliability of the evidence provided.

For any investigation, the details of events provided by witnesses are a critical element of the evidence gathered.

Witness testimony is the verbal account of events or knowledge of the facts relevant to the crime. Witness statements will assist the investigator in forming reasonable grounds to lay a charge and will assist the court in reaching a decision that the charge against an accused person has been proved beyond a reasonable doubt.

As the law has evolved regarding witnesses, many rules of evidence, definitions, and protocols have developed to govern the way witnesses may testify in court. It is important for an investigator to understand these elements as this allows an investigator to evaluate witnesses and collect witness evidence that will be acceptable to the courts.


Identifying witnesses

Defining witness types

Defining competence and compellability

Identifying the witness/suspect dilemma

Witness credibility assessment

The truthfully-incorrect witness

Recognizing dominant witness influences and conformity

Dealing with uncooperative witnesses

Conducting witness interviews

The field interview

Independent Witness

In addition to considering the evidence of a witness based on being an eyewitness or a corroborative witness, the court will also give additional weight to evidence that comes from a person who is an independent witness. An independent witness is sometimes referred to as a third-party witness. They are characterized as independent because;

They are not associated with the victim

They are not associated with the suspect

They are not in any way associated to the criminal event

Independent Witness

In other words, an independent witness is someone with nothing to lose and nothing to gain by the outcome of the case. With this inferred lack of vested interest to either side, the independent witness is seen by the court as providing unbiased testimony. Similar to the court, an investigator can attribute more confidence to statements made by persons who are established to be independent eyewitnesses or independent corroborative-witnesses to an event.

Evidence in Pakistan by a witness

In the Laws of evidence, a witness is a person who has seen a matter (that is under legal scrutiny) or who has personal knowledge of the facts of a case and can provide information about what they saw, heard, or experienced. Witnesses play a crucial role, whether it’s a nikah, a court case (either criminal or civil cases), or an investigation.

They are typically called upon to provide information upon the initiation of an FIR or to testify in court. In the laws of evidence, the testimony provided by a witness can be used to establish the facts of a case, to prove or disprove allegations, and to help determine the guilt or innocence of a defendant.


Oral Evidence: This includes any spoken statements made by a witness

or party to a case. It may include testimony given in court or statements made outside of court that are relevant to the case. Documentary evidence: This is considered any evidence which can be provided in written document form i.e an application to the court, a contract etc.

Conclusive Evidence: This is evidence that is considered to be irrefutable, and cannot be contradicted or disputed.

Direct Evidence: This is evidence that directly proves a fact, without the need for inference or interpretation.

Real Evidence: This includes any physical evidence that is relevant to the case, such as weapons, clothing, or other items that were collected from a crime scene.

Extrinsic Evidence: This includes any evidence that is introduced from outside of the case, such as prior convictions or other legal documents that are not directly related to the current case.

Incriminating Evidence: Evidence that incriminates an individual by clearly identifying the perpetrator and their involvement in the crime

Indirect Evidence: This includes any evidence that implies a fact, without directly proving it.

Original Evidence: This is evidence that is considered to be the original or primary source of information, such as a signed contract or a video recording of an event.

Derivative Evidence: This is evidence that is created from an original source, such as a photocopy of a document.

Parole Evidence: This includes any evidence that is related to the negotiations or discussions leading up to the formation of a contract.

     Prima Facie: This is evidence that is sufficient to establish a fact or case unless it is contradicted or disproved by other evidence.

     Primary Evidence: This is evidence that is considered to be the best evidence available, such as an original document or a witness who directly observed an event.

     Secondary Evidence: This includes any evidence that is not the best or most reliable source of information.

     Tertiary Evidence: This is based on secondary evidence that is further removed from the original source of information. For example, a witness testifying about the contents of a contract based on their recollection of a conversation with one of the parties would be considered tertiary evidence. Tertiary evidence is generally considered less reliable than primary or secondary evidence and may not be admissible in court without additional verification or corroboration.

Scientific Evidence: This includes any evidence that is based on scientific analysis, such as Chemical Analysis testing, or ballistics analysis.

Electronic Evidence: This includes any evidence that is stored in electronic forms, such as emails, text messages, WhatsApp messages, CDR, or digital photos.

Forensic Evidence: Forensic evidence includes scientific evidence such as DNA analysis, ballistics, and toxicology reports. This type of evidence is often used to establish a link between a suspect and a crime scene or to prove or disprove a particular theory of the case.

Expert Evidence: Expert evidence is provided by an expert witness, who is often called upon to explain complex technical or scientific concepts to the court in a way that is easily understandable to the judge.

Demonstrative Evidence: This includes any visual aids used in a case, such as photographs, maps, charts, or diagrams. These aids help to clarify complex information and make it easier for the judge to understand.

Testimonial Evidence: This includes any statements made by witnesses, both in and out of court. Witnesses may be asked to testify under oath and provide information about their observations or experiences related to the case.

Circumstantial Evidence: This includes any indirect evidence that implies a fact, without directly proving it. For example, if a suspect is seen running away from the scene of a crime(i.e. animal cruelty), this may be circumstantial evidence that suggests they were involved.

Hearsay Evidence: This includes any statements made by a person who is not present in court and cannot be cross-examined. Hearsay evidence is generally not admissible in court unless it falls under certain exceptions.

CCTV Evidence: CCTV evidence is evidence collected from cameras that are stationed to monitor premises. These can be challenged, but prove to be valuable.

Confession: A Confession is a statement made directly before a court or adjudicating individual by a person about something they themselves have done. Police confessions in Pakistan are usually not considered if the individual claims they made it due to police brutality.

Medical Evidence: This is evidence that is usually supplied with a medical report i.e. in cases of drug abuse or a second opinion in a medical negligence case.

Physical evidence, such as fingerprints, DNA samples, and other forensic evidence, is also commonly used in criminal cases in Pakistan. This type of evidence can be used to establish the identity of a suspect, to link a suspect to a crime scene, or to disprove alibis.

Handwriting Analysis: In cases where the identity of a writer, or signatory (i.e. in matters of a signature in a cheque fraud case) a handwriting expert’s report would be considered evidence.

Geographical Evidence: Evidence that can prove the whereabouts of an individual or an item. For example, in cybercrime cases, a laptop can be traced by its IP Address.

Evidence related to Movement: Any evidence that can prove the movement of an individual or item, i.e. a delivery receipt or a flight record.

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