What constitutes a sub-source level proposition according to forensic evidence?

A sub-source level proposition in forensic evidence specifically refers to a statement regarding the origin of the forensic evidence linked to a specific individual. In this case, the statement that "the DNA recovered from the crime sample came (or did not come) from Mr. Smith" directly addresses the relationship between the forensic evidence (the DNA) and a specific person (Mr. Smith). This type of proposition is critical in forensic analysis as it provides clarity about the connection between evidence and an individual, which can significantly impact the judicial process.

Other options either do not specifically tie the forensic evidence to an individual at this foundational level or reference broader categories or comparisons. For instance, stating that "the blood found was from the defendant" relates to the defendant but does not specify the source's relation to the evidence in the context of forensic analysis as clearly as the first option does. Similarly, mentioning a match with a known database does not establish individual identity but rather indicates a comparison with a broader reference pool. Witness identification in a lineup, while important, pertains to observational evidence and the reliability of witness testimony rather than forensic evidence linked to biological material.