Critically discuss the qualification, role and responsibilities and independence of an expert witness, in the english legal system

two points should be taken into consideration and focus on England and wales legal system
1to demonastrate a comprehansive understnding of the Englsh legal system, international criminal tribunals and the rules of evidence which apply in criminal and civil prceedings
2display a comprehensive understanding of the role, and the duties of the expert witness
3talk about forensic reports such as DNA, chemistry and document analysis that normally presented to court