EVALUATION FOR MAKING A CASE

Interviewing witnesses
STUDIES: Bruce, Loftus, Fisher

Generally questions have been based on research, so here are some issues:
Evaluating research;

• ecological validity: Bruce and Loftus are poor in EV, Fisher is high
• population validity/generalisability: all fairly low, but at least Fisher uses real detectives
• all are experiments: good for control and internal validity, and allow for replicability so likely to be somewhat reliable. However, many factors influence information given in witness interviews so it's unlikely that given the same situation, that any two people would give a consistent account and thus reliability is questionable. 
• usefulness and application: knowing about the inaccuracy of e-fit identification, eyewitness accounts and effectiveness of CIT has excellent real-life implications, helps inform policy and could help to change the way that juries perceive eyewitness testimonies. However the results aren't really well known, so this is a drawback.

Interviewing Suspects

• Validity of suspect interviews: police officers only 64.5% accurate at telling truth from lies, interviews lead to social desirability and all associated issues, interrogations lead to false confessions, etc. Research in this area tends to have high EV though, which is good because generalisability of findings should be strong.
• Reliability: similar to interviewing witnesses, affected by individual differences of interviewee and interviewer.
• Ethics is an important issue
• Usefulness/applications of research: shows that police officers may need more training in identifying lies and truth, highlights the unethical nature and poor validity of confessions obtained through interrogation

Creating a Profile

• Validity, effectiveness and usefulness: Mokros and Alison suggested that top down typological profiling is inaccurate as it's too reductionist, Canter found bottom up approaches effective, and Copson found that police officers may not be aware of benefits of profiling but that many would use again for a second opinion
• Reliability: top down is more reliable as it uses pre-existing categories. 
• Qualitative and quantitative data: both approaches feature some qualitative (e.g. looking at details, not numerical data) and some quantitative (e.g. looking at numbers and patterns). Quantitative is good because it's easy to analyse, qualitative is good because it's more in-depth and more humanistic. 
• Determinism: top down assumes that similar criminals create similar crime scenes, which is fairly reductionist and deterministic. Bottom up is less deterministic in that it suggests criminal choose to act consistently, and more holistic as it looks at each characteristic in turn and builds up a picture rather than choosing for example disorganised or organised.