Crime Scene Technician Practice Test

What is touch DNA?

Items where contact between a person and an object could result in the transfer of cells in an object DNA that is only found on skin cells DNA collected by swabbing air DNA present only in plants

Correct Answer:

Items where contact between a person and an object could result in the transfer of cells in an object

Explanation:

Touch DNA is genetic material that is transferred to an object simply by a person touching it. It comes from tiny amounts of cells shed from the skin, along with other trace materials, and can remain on the surface long enough to be collected later. In crime scene work, investigators swab the surfaces that were touched to recover this DNA and possibly identify who touched the item, even when there’s no obvious biological evidence. The correct idea describes transfer of cells to a surface through contact, which is the essence of touch DNA. The other statements don’t fit: DNA isn’t limited to what’s found only on skin cells, it isn’t collected from air, and plant DNA isn’t relevant to human touch DNA.

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