Since it will be difficult to prove that fraud drove down a stock's price, they might be able to hide from scrutiny.
In practice, however, it is difficult to prove that an asylum seeker showing up on Britain's doorstep first entered Europe through France.
There are suggestions that unemployment can even lead to cardiovascular disease, although it is difficult to prove that job loss causes heart damage.
But researchers doubted whether the syndrome really existed and argued that even if it did, it would be difficult to prove that the drug worked.
Given how much cancer already exists in the world, it would be very difficult to prove that anyone's cancer was caused by the incident at Fukushima Daiichi.
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At some point in the near future, it will be very difficult to prove to a computer that we are human and not a bot.
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Jonathan Kent says research has linked growing commercial pressures on children to higher rates of depression, lower self-esteem and to mental health problems but that it is very difficult to prove such a link.
Bernstein's Porges has written that it may prove difficult to convince insurers to let doctors and patients try the drug unless its effectiveness and safety far outstrip that of Fosamax.
An analogy here would be trying to prove that brand advertising results in greater revenue, it intuitively makes sense but is difficult to prove.
However, that is difficult to prove.
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Meantime, some business people report that incoming aid is being siphoned off and sold, but that's difficult to prove, the reporter says.
It is difficult to prove - for prosecution or defence - that, in the face of these uncertainties, an individual cot death was either definitely due to abuse, or definitely not.
But that line may prove difficult to defend as inflation continues to surge.
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It also could prove too difficult to implement in a country that has little technical expertise in handling complex financial changes.
Heart attack rates in the study may be so low that it will be difficult to prove any difference between drug regimens.
Professor Malcolm Parker, and Dr Jan Brosens from the Institute of Reproductive and Developmental Biology at Imperial College, London, wrote in an accompanying commentary that it was still difficult to prove a link between dioxins and human disease.
Analysts had a mixed response to the deal but seemed to agree that while the synergies where there, integration may prove difficult and Advanced Micro would still struggle to gain market share from Intel (see " AMD Makes Its Move").
Even proponents acknowledge that smoking restrictions could prove difficult to enforce, however.
They say they have an exit plan, but that is likely to prove quite difficult in practice.
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The danger now is that even these roles will prove difficult to sustain.
One reason for Sherwin's success: In a classic tort case--this defendant injured that plaintiff--it's very difficult to prove whose paint is on the walls of an old house.
Prosecutors may have determined that an intent to harm others would be too difficult to prove in court, and so they offered him a plea agreement.
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That is extremely difficult to know, so his insight may not prove particularly valuable.
Furthermore, a reform that makes it difficult for the unhealthy to get affordable cover is likely to prove politically unsustainable.
It is thought that prosecutors decided against this because insider trading would have been too difficult to prove in a criminal case.
In order to prosecute, the police can also try to prove a merchant has knowingly handled stolen metal - but that can be difficult.
Until that changes, the next North American summit will probably prove just as difficult to schedule.
It is outrageous that one or two senators' votes may make the difference between an initiative that will be, at the very best, a new and difficult management burden for a military already overtaxed with its warfighting responsiblities, and that may well actually prove to be devasting for the military.
The prosecution thus has to prove both that Mr Taylor bears responsibility for the actions of a third party (always a difficult task), and to show that he was arming the rebels so as to terrorise the Sierra Leonean population and to gain control of the country's diamonds.
Critics say that conditions may not improve even after the standards are in place, because these could prove difficult to enforce.
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