'Source' or 'activity' What is the level of issue in a criminal trial?

摘要

The "source-to-activity" problem is not one that crops up solely in DNA cases; it can occur in any type of scientific evidence, especially with transferable materials such as fibres, traces of drugs, explosives and gunshot residues. Experts, investigators, lawyers, judges and jurors all need to understand the problem and apply mitigating procedures, as do experts themselves.