Which statement about using two moistened sterile swabs is true?

Which statement about using two moistened sterile swabs is true?

• A. They may not collect as much evidence
• B. They always collect more evidence than a single swab
• C. They are best used for DNA only
• D. They should be avoided entirely

Answer: (A)

Using two moistened sterile swabs does not automatically yield more evidence. In practice, the first swab typically captures the majority of available cells or trace material from a targeted area, so adding a second swab often yields little additional material and can even dilute or spread what remains. The extra handling also raises the chance of contamination and can complicate lab analysis and interpretation. So, the idea that two swabs may not collect as much evidence is a realistic consideration: more swabs do not guarantee more evidence and can reduce the overall yield if not used purposefully. In the field, focus is on maximizing recovery with proper technique on a single area, and only use additional swabs when there is a clear, separate area to sample, all while preserving sample integrity and chain of custody.

Using two moistened sterile swabs does not automatically yield more evidence. In practice, the first swab typically captures the majority of available cells or trace material from a targeted area, so adding a second swab often yields little additional material and can even dilute or spread what remains. The extra handling also raises the chance of contamination and can complicate lab analysis and interpretation. So, the idea that two swabs may not collect as much evidence is a realistic consideration: more swabs do not guarantee more evidence and can reduce the overall yield if not used purposefully. In the field, focus is on maximizing recovery with proper technique on a single area, and only use additional swabs when there is a clear, separate area to sample, all while preserving sample integrity and chain of custody.