Tonight on em>Dateline an official said that Karr's DNA will be crucial, that if it matches what was found on Ramsay's body and inside her underwear, that will be an answer but if it doesn't match, that would NOT prove that it was not Karr who killed her, that "we all know that sometimes DNA comes from an extraneous source."

DICTIONARY QUOTE

EXTRANEOUS:
1. Not constituting a vital element or part.
2.Inessential or unrelated to the topic or matter at hand;
3 Irrelevant. See Synonyms at irrelevant.
4. Coming from the outside: extraneous interference.

What kind of "extraneous source"