In a case like this, where phase 2 is not conclusive, the decision becomes agonizing.
Tim Jacob, a smell researcher at the University of Cardiff, said the work was "supportive but not conclusive".
Now scientists recognize that one example is an anecdote and not conclusive.
They said their findings, while not conclusive, suggested a long-term risk of death from heart disease is associated with the mother's genetic predisposition.
This is not conclusive evidence that fertility has been reduced in these men, say the research team, but certainly should lead to further investigation.
That's not conclusive proof, but it does look like the boost has a lot to do with the pressure to find something to do when jobs are hard to find.
The researchers say their findings are not conclusive but suggest that men who want to improve their fertility might want to look at increasing the amount of physical exercise they do if they currently do little.
But, again, the evidence is not conclusive.
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It does not offer conclusive proof that this is causing a rise in asthma.
Research into the neuroscience of sex addiction has not been conclusive, the Mayo Clinic said.
The studies have not been conclusive and most dermatologists still recommend such products.
They join a host of vaccines that have been very promising in animals but have not shown conclusive results in humans.
Their findings may not be entirely conclusive because they did not test immigrant children who had not started puberty early for pesticides.
The United States has not made conclusive findings about the incident, although there are multiple investigations under way to determine exactly what happened.
But the fixes presented by Boeing on Friday will not be conclusive, as airline safety inspectors have found no faults with the battery used in the 787.
But a full forensic report on coroners' findings is not expected to be available for at least two months - and may not be conclusive given the two-decade delay before the investigation.
"I think it's an interesting paper, but not necessarily conclusive, " says Dr. Linda Van Horn, a nutritional spokesperson for AHA and a professor of Preventive Medicine for the Northwestern University Comprehensive Center on Obesity.
Some conclusions might have been expected: that there was some evidence - not quite conclusive perhaps, but evidence all the same - that the waiting list target regime really did increase the number of patients treated by English hospitals compared to Welsh ones.
The situation today is that we do not have any conclusive evidence that she should not be allowed to run.
Actions or statements by either side are likely not to be conclusive.
Rumsfeld said he had not seen any conclusive reports on whether Saddam was dead, in hiding or had successfully fled to another country.
Olaf said it had not found "conclusive evidence of the direct participation of Mr Dalli but did consider that he was aware of these events".
Sir Jeremy concluded the emails - which it has since been alleged were sent by an off-duty police officer - did not provide "conclusive or reliable evidence" against Mr Mitchell.
So you all remember that not-so-conclusive iFixit teardown of the iPod touch right?
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Previously, a jury on the case wound up not coming to a conclusive decision, resulting in a mistrial.
That leaves someone from Microsoft and searching through current and past ranks does not lead to a conclusive answer.
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