Which procedure provides the best evidence for the presence of a suspect at a crime scene?

The procedure that provides the best evidence for the presence of a suspect at a crime scene is sequencing DNA from the cells of the suspect and from cells in blood collected at the crime scene. DNA sequencing allows for the comparison of genetic material at a very detailed level, providing a high degree of specificity and accuracy in identifying individuals. Each person's DNA profile is unique (with the exception of identical twins), which means that a match between the suspect's DNA and that found at the crime scene offers strong evidence linking the suspect to the scene.

Additionally, DNA sequencing can reveal information about the individual's identity, family relations, and even certain biological traits. This high level of discrimination makes it a powerful tool in forensic science, providing compelling evidence in criminal investigations.

Other methods, while useful, do not offer the same level of specificity. For example, blood typing can indicate a blood type but cannot identify an individual with the same type. Analyzing hair strands can yield information about the origin of the hair but is less conclusive than DNA. Karyotyping provides chromosomal information, which is useful for certain medical or genetic inquiries but is not typically used in forensic investigations for individual identification. Thus, DNA sequencing stands out as the most reliable method for confirming a suspect's presence