What is 'trace evidence' and how is it studied in CSI?

What is 'trace evidence' and how is it studied in CSI?

Trace evidence is just what it sounds like. It's minute items of evidence. Sometimes evidence that can't even be seen with the human eye and must necessitate the collection of items that are carriers of trace evidence. But trace evidence is just what the word says. It's minute items that must be brought back to the lab for examination, certainly microscopic examination and other sensitive technologies must be brought into play to deal with those items of evidence.