Mr Johnson said there would be no further action against his aide as there was "no conclusive evidence".
Only now that conclusive evidence is in does the drug get recalled.
In April, mission scientists announced Opportunity had found conclusive evidence that a salty sea once lapped the shores of Meridiani.
The situation today is that we do not have any conclusive evidence that she should not be allowed to run.
Despite claims to the contrary, there is no conclusive evidence that less medical spending results in better or equal long-term health outcomes.
If the US government officially states that video games are a mental health hazard without conclusive evidence, that sets a dangerous precedent.
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"This year's report shows conclusive evidence of improving stillbirth and neonatal mortality rates, " said Dr Jon Dorling, lead author of the report.
Therefore, the controversy between proponents and opponents of flat-rate taxation is bound to continue at least until more conclusive evidence becomes available.
ECONOMIST: Will more of eastern Europe adopt flat-rate tax regimes?
No conclusive evidence, however, to substantiate a clear relationship between the 65-year reduction in the top statutory tax rates and economic growth.
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Although conclusive evidence for life on Mars (or on any other foreign planet) has yet to turn up, humans are an impatient species.
The airport said one Jet2 aircraft had reported engine-related problems on three occasions, but there was no conclusive evidence connecting this with the runway.
BBC: Jet2 resumes flights from Belfast International Airport
The airport said one Jet2 aircraft has reported engine-related problems on three occasions, but there is no conclusive evidence connecting this with the runway.
This is not conclusive evidence that fertility has been reduced in these men, say the research team, but certainly should lead to further investigation.
Dr Keith Prowse from the British Lung Foundation said further investigation was needed for more conclusive evidence about the effects of diet and lifestyle.
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".
But given the problems of getting access to a war zone to gain conclusive evidence, finding absolutely definitive evidence may be hard and may take time.
BBC: Syria chemical weapons claims: UK and US tread cautiously
The replay official must have conclusive evidence that the penalized player didn't intentionally target a defenseless player in order to overturn the call on the field.
In a statement on 19 October Olaf said its investigation had "found no conclusive evidence of the direct participation of Commissioner Dalli in the operation for requesting money".
Dr. CHRISTIANE AYOTTE (Anti-Doping Lab, Montreal): It has been giving us the last evidence, and the conclusive evidence, that we needed to, let's say, be comfortable with our findings.
Very worrisome but less conclusive evidence has also linked Celebrex and Bextra, both made by Pfizer (nyse: PFE - news - people ), to some heart risk.
In 2007 he was acquitted of her murder, for lack of conclusive evidence, but sentenced to life in prison on eight other counts of rape and one of rape and murder.
While there is no conclusive evidence of chemical weapons at Khan Aasal, U.S. and other officials have not ruled out the possibility that harmful chemicals were emitted as a result of an attack in Syria.
Gareth Davies, Chief executive of the Cleft Lip and Palate Association, said past studies had indicated that taking folic acid may help prevent cleft lip and palate in so called "high risk" groups but until now there had been no conclusive evidence to back this up.
Registered nurses and doctors administer the drips at Tenteki, but there's no conclusive medical evidence to back up the health claims.
But there has been no conclusive scientific evidence to back such claims.
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.
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.
But, again, the evidence is not conclusive.
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But those close to the project say that with or without conclusive DNA proof, the circumstantial evidence alone is striking.
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