What should not be neglected while gathering evidence at a crime scene?

When gathering evidence at a crime scene, using proper techniques to avoid contamination is crucial. Contamination can compromise the integrity of the evidence, making it less reliable or even inadmissible in court. Proper handling, collection, and storage techniques are essential to ensure that evidence accurately reflects the scene and has not been affected by outside influences. Forensic protocols are specifically designed to maintain a secure chain of custody and preserve the original state of the evidence collected.

Researching a suspect's history, identifying unrelated items, and conducting interviews are all important elements of an investigation but do not directly relate to the technical aspects of evidence collection. If evidence is contaminated, no amount of anticipation or analysis can rectify that issue, emphasizing the critical nature of selection B in the context of crime scene investigation.