One early reason for banning tests was the idea that, as years passed, the Russians and Americans would doubt the reliability of their bombs and thus be reluctant to use them.

CNN: ASIANOW - Asiaweek

The second cloud over tropical certification schemes, as Wal-Mart may find, is doubt about their reliability.

ECONOMIST: Western consciences can do only so much to conserve forests

They cast doubt on the reliability of her memories and suggested there was a possibility they could be false.

BBC: 'Memories' of historic abuse leading to justice errors

This case, in Dr Cole's view, casts serious, and for the first time quantitative, doubt on the reliability of fingerprints.

ECONOMIST: Fingering fingerprints | The

But other economists at the conference cast doubt on the reliability of Mr Wyplosz's results, since his data included few periods when inflation was actually below 2%.

ECONOMIST: Central banks disagree on the rate of inflation to aim for

Prosecutor Manuela Comodi refuted the testimony from independent forensics experts that cast doubt on the reliability of the evidence, insisting police forensic officers had handled the DNA material properly.

CNN: Amanda Knox: How the four-year court saga unfolded

He was first convicted in 2001 but an Old Bailey retrial was ordered after doubt was cast on the reliability of gunshot residue evidence.

BBC: George not guilty of Dando murder

Mr George was convicted in 2001 but an Old Bailey retrial took place in 2008 after doubt was cast on the reliability of gunshot residue evidence.

BBC: Barry George loses compensation case