Criminology · Year 13 · From Crime Scene to Courtroom · 1.º Período

Investigative Techniques

A critical look at techniques such as forensic analysis, surveillance, profiling, and eyewitness testimony. Students will evaluate the reliability and legal boundaries of these methods.

TL;DR:This topic focuses on the tools used to identify and link suspects to crimes, including DNA profiling, fingerprinting, surveillance, and offender profiling. Students must move beyond a basic description of these techniques to critically assess their usefulness and reliability within the English and Welsh legal framework. This aligns with WJEC AC 1.2, requiring a balanced view of how technology and psychology aid investigations.

• National Curriculum Attainment Targets
• WJEC Level 3 AC 1.2 Assess the usefulness of investigative techniques in criminal investigations
• WJEC Level 3 AC 1.3 Explain how evidence is processed

About This Topic

This topic focuses on the tools used to identify and link suspects to crimes, including DNA profiling, fingerprinting, surveillance, and offender profiling. Students must move beyond a basic description of these techniques to critically assess their usefulness and reliability within the English and Welsh legal framework. This aligns with WJEC AC 1.2, requiring a balanced view of how technology and psychology aid investigations.

Students will also examine the fallibility of human-based techniques, such as eyewitness testimony and the 'E-FIT' process. By exploring the legal boundaries of covert surveillance and the ethical implications of DNA databases, students develop the evaluative skills necessary for higher-mark responses. The topic highlights the tension between investigative efficiency and the protection of civil liberties.

Students grasp this concept faster through structured discussion and peer explanation of case studies where specific techniques led to both successes and miscarriages of justice.

Key Questions

1. How reliable is DNA profiling in securing a conviction?
2. What are the ethical implications of covert surveillance?
3. How does eyewitness testimony impact the trajectory of an investigation?

Watch Out for These Misconceptions

Common Misconception

Offender profiling is a definitive science that identifies the exact killer.

What to Teach Instead

Profiling provides a 'type' of person or a likely geographical area, not a name. Using a gallery walk of failed profiles helps students see that profiling is an investigative tool, not a forensic certainty.

Common Misconception

DNA evidence is infallible and always leads to a conviction.

What to Teach Instead

DNA can be planted, contaminated, or belong to an innocent person who was at the scene previously. Collaborative investigations into secondary transfer cases help students understand the limitations of forensic evidence.

Active Learning Ideas

Formal Debate

The Ethics of DNA Databases

Divide the class into two sides to debate whether the UK should have a universal DNA database. Students must use evidence regarding crime detection rates versus the right to privacy under the Human Rights Act.

50 min·Whole Class

Think-Pair-Share

The Reliability of Eyewitnesses

Show a short video of a crime and then ask students to describe the perpetrator. Compare results in pairs to see discrepancies, then share with the class to discuss why the 'Turnbull Rules' are necessary in court.

20 min·Pairs

Gallery Walk

Profiling Successes and Failures

Display posters of famous cases involving profiling, such as the 'Railway Rapist' (Duffy) and the Rachel Nickell case (Stagg). Students move around the room to identify why profiling worked in one and failed in the other.

35 min·Small Groups

Frequently Asked Questions

What are the legal rules for eyewitness testimony in the UK?

The 'Turnbull Rules' (1977) require judges to warn juries about the potential unreliability of eyewitness identification. They must consider the length of time the witness saw the suspect, the distance, and the lighting conditions.

Is offender profiling used frequently by the police?

It is used relatively rarely and usually only for serious, serial offences like arson, rape, or murder. It is considered a 'last resort' tool when traditional investigative methods have failed to produce a suspect.

How does the Regulation of Investigatory Powers Act (RIPA) affect surveillance?

RIPA 2000 governs how public bodies, like the police, use covert surveillance. It ensures that any interference with a person's privacy is necessary, proportionate, and legally authorised, preventing the abuse of state power.

What are the best hands-on strategies for teaching investigative techniques?

Simulating the 'unreliability' of techniques is highly effective. For example, a memory-based task for eyewitness testimony or a 'blind' profiling exercise using crime scene data allows students to see the margin for error. These hands-on experiences make the theoretical limitations of the techniques much more memorable and easier to explain in exams.