No doctor interviewed for this story was willing to say with certainty that Natrecor was dangerous.
But he said that it would "need further development before we can say with certainty".
No one can say with certainty who will benefit by taking a certain drug and who will not.
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"If there's a switch from euro to drachma nobody can say with certainty what's going to happen, " she says.
But if you can say with certainty that environmentally your product is better, there can be a business advantage there.
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Idzik would not say with certainty that Sanchez will be in training camp with the Jets to even compete with Smith.
How can we say with certainty that any other interpersonal goals would not have trumped academic ones in a head-to-head comparison?
Nor can we say with certainty what impact a medical condition will have on someone's life or how they might experience a treatment's side effects.
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This might be mere myth, but one can say with certainty that the iris has always inspired with its fragile, velvet petals and long, slender stems.
"We can say with certainty that Ammar Harris is the suspect who fired the fatal shots, " Las Vegas police captain Chris Jones told reporters on Monday afternoon.
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There are very few things you can say with certainty, but one of them that you can say is that they will never pay back their debts.
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The one thing we feel we can say with certainty following these announcements is that we expect a radical resetting of price expectations going forward in the sequencing market.
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"Some of the skills required to operate were impaired in the study, but it is difficult to say with certainty how this would translate into real clinical performance, " she says.
And leading members of Congress with access to intelligence reports have said if nothing else Russian documentation is insufficient to say with certainty that nuclear materials have not been stolen.
Paul Vance, a spokesman for the Connecticut State Police, said officers didn't fire their weapons after arriving at the campus, but he couldn't say with certainty how the alleged gunman was killed.
No one can say with certainty how much influence it has on the main political groups, including the one loyal to Mr Sadr, on whom Iran's government seems to blow hot and cold.
"I completely accept nobody can say with certainty what the future for Afghanistan will be, but what I can say is that the future of Afghanistan will have to be determined by the Afghan people, " Mr Hammond said.
It is impossible to say with certainty how bad the 21st century's heating will be, but there is a large chance of it getting hot enough to do harm, and a far from trivial chance of things turning catastrophic.
Whether they occurred inside the camp or outside the camp I cannot say with any certainty.
In Brazil, there is one bubble we can say with complete certainty.
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The only thing I can say with utter certainty is that come what may, my feelings for George Clooney will remain unsullied.
After playing some of the multi-player beta on PlayStation Plus, I can say with some certainty that the game does indeed look fantastic.
If Mr Blunkett really knew nothing about these scams, how can he possibly say with any certainty there are no other similar abuses happening elsewhere.
But no one can say with any certainty just how long it takes to reach that day of reckoning when the debt pile comes tumbling down.
For all the pomp and circumstance and to- tier talent I can say with absolute certainty that is was the most disappointing event I have ever attended.
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Having the advantage of the hindsight my gray hair affords me, I can say with great certainty that who you are as a person is infinitely more important than the title you hold at work.
Anderson and her co-author are unable to say with any certainty that eating dinner together more often, getting more sleep, and watching less TV will help any given child lose weight, because of the other factors that may contribute to a child's obesity (or that may protect normal-weight children from becoming obese).
Though I cannot say it has been an easy journey, I can say this with all certainty: This past year I have been given the gift of perspective, and for that I am thankful.
Nobody can say with any degree of certainty what policy will be on Jan. 1, 2013.
But I can honestly say that, in my many conversations with him, the dominant tone he struck was optimism and certainty, both for Apple and for the digital revolution as a whole.
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