http://www.spiegel.de/international...blower-doctor-peter-wilmshurst-a-1052159.html "....often the scientists don't even have to be offered bribes or threatened to conceal data. Some do it without any industry pressure. It is much better for a researcher's career to publish positive results. And that is what it's about: to climb up the ladder a bit more." "You have made the principal investigator sign a confidentiality agreement beforehand, so that you have control over the data. And you may put into the contract arrangements for a bonus in case of a positive result. (grins) This may help the researcher interpret the data in a more favorable way for you."