But so do tax credits, and there's no proof that they have boosted investment.
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But he added there was "no proof, no trace" of the alleged secret payments.
The US Defence Department told the BBC that the ruling militia had produced no proof.
And French Defence Minister Jean-Yves Le Drian said he had no proof of either man's death.
BBC: Islamist commander Abou Zeid's death in Mali 'probable'
Israel says there is no proof it was behind the killing in Dubai in January.
"I have no proof of the deaths of those two men, " Le Drian said.
The UAE believes Israel's intelligence agency, Mossad, was involved, though Israel insists there is no proof.
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There's also no proof from randomized trials that more frequent treatment saves lives or prevents hospitalizations.
The United States has no proof of any connection, Raissi's lawyer, Richard Egan, said.
The biggest problem with these estimates is they are just guesses, with no proof backing them up.
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This has been checked for the first 100 billion zeros, but no proof appears to be in sight.
Israel's U.S. Embassy said Wednesday that it had no proof that Iran was the instigator of the attack.
But there is also no proof in those numbers to support his claim that Labor manipulated its report.
But researchers have found no proof that obesity is directly caused by ads for sweets or junk food.
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There's also no proof that company managers have discriminated against employees at a greater rate than anywhere else.
Britain's National Health Service agrees: having studied the available research, it finds no proof of harm from turbines.
So there is no proof that Liptruzet prevents heart attacks, strokes, or other cardiovascular complications better than atorvastatin alone.
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He said because he had no proof he could cover living costs, an offer from the college was withdrawn.
There is no proof of that and, whatever the explanation, the rebels now have to cope with the consequences.
Since no bodies have been found, and thus no proof of death, the offences are held to be continuing.
There is no proof that the Conservatives organised a campaign of voter misinformation.
The government has dismissed Mr Aponte as a discredited turncoat offering no proof.
Given that there's no proof the players made this pact, it's impossible to know what their motives might have been.
She said even if Fuhrman felt that way in 1985, there was no proof he felt that way in 1994.
There is no proof that AGI-1067 will work, but cardiologists such as Nissen give the drug a pretty good chance.
There is no reason to believe that these new treatment regimens wouldn't work with PEG-Intron, but there is also no proof.
They found classified documents on her computer, though they decided there was no proof she had received them from Mr. Petraeus.
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"We had a feeling that the error was not an accident, but had no proof, " manager Curt Morehouse said in a statement.
But he said until a body was found it could not be confirmed and the defence minister said there was no proof.
BBC: Islamist commander Abou Zeid's death in Mali 'probable'
Some say there is no proof piracy costs sales, and others maintain the older numbers understate the extent of the problem today.
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