Yes, I've heard of a few cases in which no DNA evidence was found. Not to say that it wasn't there, but it just wasn't found. However, other evidence was found that helped the police to focus on a small group of people.
For instance, Richard Ramirez, the Night Stalker. He was hard to catch merely because he was a serial killer who did not have any particular preference in victims; there was other evidence that helped to find him, though. Not the least of which was that he couldn't keep his mouth shut. That's more common than people think.
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My free will...I never leave home without it.
--House
Someday I want to be rich. Some people get so rich they lose all respect for humanity. That's how rich I want to be.
-Rita Rudner
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