Many biologists now say that step may have destroyed potential genetic clues to the culprit's identity.

A potential clue to the Panionium's location was the discovery of an inscription in the area in 1673.

The result has been a dwindling flow of potential clues.

But amid it all, Cardona had seized upon a potential clue.

His chest swelled and he felt like a hero, as if he had caught the murderer instead of just finding a potential clue.

You think just because we find one potential clue, we stop searching?

Every potential clue leads to small revelations, but bigger mysteries.

But with the benefit of much hindsight, investigators are seeing potential clues that went virtually unnoticed almost a decade ago.

In the report were new findings concerning potential clues that intelligence agencies did not adequately pursue before Sept. 11.

In search of potential clues, he slowed at every side road and used a spotlight, in order to examine the ground.