No doctor interviewed for this story was willing to say with certainty that Natrecor was dangerous.
"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.
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.
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).
"If there's a switch from euro to drachma nobody can say with certainty what's going to happen, " she says.
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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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.
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?
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.
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