Criminal Investigation

Course Description

Criminal Investigation introduces learners to the foundational aspects of criminal investigation, including crime-scene examination, collection of evidence and searching for witnesses, developing and questioning suspects, and protecting physical evidence.

Within the SCNS taxonomy, CJT is the Criminal Justice Technology prefix. Daytona State publishes this at 3 credits, offered fall and spring.

The most valuable thing a modern investigation course can teach is how investigations go wrong, because that evidence is now unusually good. Several hundred DNA exonerations have provided something the field never previously had: a set of cases where the true answer is known, and the investigative record can be examined against it. The recurring contributors are consistent — mistaken eyewitness identification, false confessions, flawed forensic testimony, and investigative tunnel vision — and every one of them is a process failure rather than a failure of effort or integrity. An investigator who knows those four cold is measurably better than one who does not.

Daytona State does not publish a contact-hour figure for this course. It is an unsuffixed lecture course, and the institution's lecture convention is 15 contact hours per credit — SYG2000, PSY1012 and AMH2010 are all live at 3 credits and 45 hours. This course is priced at that convention.

Learning Outcomes

Required Outcomes

• Describe the purpose, phases, and objectives of a criminal investigation.
• Describe the responsibilities of the first officer at a scene.
• Secure and control a crime scene and establish a perimeter.
• Describe scene documentation by notes, photography, sketching, and video.
• Conduct a systematic scene search using an appropriate pattern.
• Describe Locard's exchange principle and its investigative implications.
• Identify, collect, package, and preserve physical evidence correctly.
• Avoid contamination and cross-transfer of evidence.
• Establish and maintain chain of custody.
• Describe biological evidence and the requirements for DNA analysis.
• Describe latent print, trace, firearm, and impression evidence.
• Evaluate the demonstrated validity of forensic disciplines critically.
• Describe digital evidence and the requirements for handling it.
• Locate, identify, and interview witnesses.
• Distinguish an interview from an interrogation.
• Conduct an interview that elicits accurate information.
• Describe the reliability of eyewitness memory and the factors affecting it.
• Describe identification procedures that reduce error.
• Describe interrogation methods and the risk of false confession.
• Describe legal requirements governing questioning and admissibility.
• Develop and evaluate investigative hypotheses.
• Recognise confirmation bias and tunnel vision in your own reasoning.
• Prepare a case file and an investigative report.
• Describe courtroom testimony and the investigator's obligations in it.

Optional Outcomes

• Describe investigation of specific offence types.
• Describe death investigation and the medical examiner's role.
• Describe financial and cyber investigation.
• Describe undercover and surveillance methods.
• Describe informant management and its risks.
• Describe cold case review and post-conviction investigation.

Major Topics

Required Topics

• Purpose and phases of investigation
• The first officer's responsibilities
• Scene security and control
• Scene documentation
• Systematic scene search
• Locard's exchange principle
• Evidence collection and preservation
• Contamination avoidance
• Chain of custody
• Biological evidence and DNA
• Latent print, trace, firearm, impression evidence
• Validity of forensic disciplines
• Digital evidence
• Locating and interviewing witnesses
• Interview versus interrogation
• Effective interviewing
• Eyewitness memory and its limits
• Identification procedures
• Interrogation and false confession
• Legal requirements and admissibility
• Developing investigative hypotheses
• Confirmation bias and tunnel vision
• Case files and reports
• Courtroom testimony

Optional Topics

• Offence-specific investigation
• Death investigation
• Financial and cyber investigation
• Undercover and surveillance
• Informant management
• Cold case and post-conviction review

Resources & Tools

• Florida Department of Law Enforcement — Criminal Justice Standards and Training Commission (fdle.state.fl.us) — free; the authority on Florida officer certification, training requirements, and standards.
• Online Sunshine (leg.state.fl.us) — free full text of the Florida Statutes, including Chapter 776 on the justifiable use of force and Chapter 901 on arrest. Read the statute, not a summary.
• National Institute of Justice (nij.ojp.gov) — free; research on investigative practice, eyewitness identification, and forensic science.
• The Innocence Project (innocenceproject.org) — free; its case analyses are the clearest available account of how investigations go wrong, and they are professional development rather than criticism.
• PCAST and National Academy of Sciences reports on forensic science — free; the authoritative assessment of which forensic disciplines have demonstrated validity and which do not.
• Your local agency — ride-alongs, internships, and Explorer programmes are frequently available and are the best way to find out whether this work suits you.

Career Pathways

• Detectives and criminal investigators — SOC 33-3021; generally reached after service as a patrol officer.
• Police and sheriff's patrol officers — SOC 33-3051; ⚠ requires completion of a certified academy and state certification in Florida.
• Forensic science technician — SOC 19-4092; crime scene and laboratory work, frequently with a science degree.
• Crime scene technician — a distinct civilian role in many Florida agencies.
• Corrections and probation — SOC 33-3012 and 21-1092.
• Federal law enforcement and investigative agencies — competitive, usually requiring a degree and frequently experience.
• Private investigation and corporate security — ⚠ private investigators are licensed in Florida under Chapter 493, Florida Statutes.
• Insurance fraud and loss prevention investigation.
• Victim advocacy and court support roles.
• Transfer to a bachelor's degree in criminal justice or criminology — increasingly expected for promotion and for federal roles.
• ⚠ Be realistic about the work. Shift work, exposure to trauma, and public scrutiny are all part of it. The mental health toll on investigators handling serious crime is documented and real — agencies increasingly provide support, and using it should be ordinary.

Special Information

⚠⚠ Eyewitness memory is malleable — and the procedure determines how much

• Mistaken eyewitness identification is the single largest contributing factor in DNA exoneration cases. The witnesses were not lying; they were confident and wrong.
• ⚠ Memory is reconstructive, not a recording. It is altered by what happens after the event — by other witnesses, by media, by the identification procedure itself — and the altered memory feels exactly as vivid as an accurate one.
• ⚠⚠ Confidence is not a good guide to accuracy once a witness has been given feedback. Telling a witness "that's the one we suspected" after an identification measurably inflates their later confidence and their recollection of how good a view they had. Say nothing.
• Use double-blind administration — an administrator who does not know the suspect cannot unintentionally cue the witness, and the cueing is usually unintentional.
• Take a confidence statement at the moment of identification, in the witness's own words, before any feedback. Initial confidence carries information; later confidence does not.
• Build fair arrays. Fillers should match the witness's description, so the suspect does not stand out — an array where only one person could match is not a test.
• Instruct the witness that the perpetrator may not be present, which substantially reduces the pressure to choose someone.
• ⚠ Interview witnesses separately and early, and record it. Witnesses who talk to each other converge, and the convergence is invisible afterwards.
• Ask open questions and let the witness talk. Leading and closed questions insert information into the memory, and the witness will later recall it as their own.

⚠⚠ False confessions are real, and tunnel vision is how they get believed

• People confess to crimes they did not commit — this is documented in a substantial number of proven exoneration cases, and it is the finding investigators find hardest to accept.
• ⚠ Juveniles and people with intellectual disabilities or mental illness are markedly more vulnerable, as are people who are exhausted, frightened, or told that confessing is the way out.
• ⚠⚠ Confrontational, guilt-presumptive techniques raise the risk, particularly minimisation, false claims about evidence, and very long interrogations. Information-gathering approaches produce more accurate information and fewer false admissions, and the research on this is consistent.
• Record interrogations in full, from the beginning. It protects the suspect, it protects the investigator against later allegations, and it is the only way anyone can later assess how a confession was obtained.
• ⚠ Guard the details. A confession is corroborative only if it contains information the investigator did not supply — and details leak easily through questions, photographs, and reactions. A confession that only repeats what police already said proves nothing.
• ⚠⚠ Tunnel vision is the mechanism that ties all of this together. Once an investigator forms a theory, ambiguous evidence starts reading as confirmation, contradictory evidence gets explained away, and alternative suspects stop being pursued — and it happens to conscientious people, which is exactly why process protections exist.
• Actively seek disconfirming evidence. Ask what would show your theory is wrong, and go and look for it — this is the single most useful habit in investigation.
• Pursue alternative suspects properly, and document that you did.
• ⚠ Brady obligations are not optional. Evidence pointing away from the suspect must be documented and disclosed — concealing it is both misconduct and a leading cause of overturned convictions.
• Invite a second opinion. A colleague reviewing the file cold catches what the case investigator can no longer see.

⚠⚠ Chain of custody and contamination — the unglamorous half that decides cases

• Evidence is only as good as its documented handling. A break in the chain of custody can render probative evidence inadmissible, and it is entirely preventable.
• Record every transfer — who had it, when, and why — from collection to court.
• ⚠⚠ Modern DNA analysis is sensitive enough to detect trace amounts, which means the investigator's own DNA, and transfer between items, are genuine contamination risks. Gloves changed between items, clean packaging, and separate handling are not fussiness.
• Package biological evidence properly. Wet biological evidence must be dried and packaged in paper, not sealed in plastic, which promotes degradation.
• Control access to the scene from the first moment and keep a log. The commonest source of scene contamination is people with a legitimate reason to be there.
• Document before you disturb. Photograph and sketch in place; a scene cannot be reconstructed once it is moved.
• ⚠ Be sceptical of forensic disciplines that have not demonstrated validity. Rigorous national reviews have found that several long-accepted pattern-comparison methods lack established error rates — and overstated forensic testimony is another recurring contributor to wrongful convictions.
• State conclusions with the certainty the science supports, and no more. "Consistent with" and "a match to the exclusion of all others" are very different claims.

⚠⚠ Constitutional limits are not obstacles to investigation — they are the conditions of a usable case

• Evidence obtained unlawfully can be excluded, and a case built on it can collapse entirely. The rules are what make a conviction stand up, which is the practical argument as well as the principled one.
• The Fourth Amendment governs search and seizure. Searches generally require a warrant supported by probable cause, and the exceptions are specific and defined rather than general.
• ⚠ Know the exceptions precisely — consent, exigent circumstances, plain view, search incident to arrest, and automobile searches all have boundaries, and an officer who exceeds them loses the evidence.
• Consent must be voluntary, and it can be withdrawn. Consent obtained by implying that a refusal is not permitted is not consent.
• The Fifth Amendment governs self-incrimination. Miranda warnings are required for custodial interrogation, and both "custody" and "interrogation" are legally defined terms rather than everyday ones.
• ⚠ Once a suspect invokes the right to counsel, questioning must stop. Continuing, or returning later to try again, is where confessions are lost.
• The Sixth Amendment guarantees counsel, and it attaches at a defined point in the process.
• ⚠⚠ Brady obligations require disclosure of evidence favourable to the defence. Investigators must document and pass on everything, including what points away from the suspect — and failure to disclose is a leading cause of overturned convictions.
• Document everything contemporaneously. Notes, times, and who was present are what a case is reconstructed from years later.
• ⚠ Rule 11 applies. Search and seizure law changes through litigation continually — verify current law and agency policy rather than relying on a course guide.

How Florida course levels affect transfer

The first digit of an SCNS number denotes the year of offering, not transferability. Courses at the 1000 and 2000 levels transfer transparently between Florida public institutions, and 3000 to 4000 is unproblematic since both are upper division. The boundary that actually matters is 2000 to 3000, where lower-division credit generally cannot satisfy an upper-division requirement.

CJT2100 is 3 credits and approximately 45 contact hours, offered fall and spring at Daytona State.

⚠ This is an academic course, not a law enforcement academy course, and it does not lead to Florida officer certification by itself — see the career notes above.