By randomizing patients, almost all factors (known orunknown) that might influence the outcome are present in equal proportions in the various treatment groups.
As proposed, any strategy for reducing, avoiding, or deferring tax liability, whether knownorunknown at the time of the invention or application for a patent, would not qualify.
Such information could allow the NSA to establish links between terrorist operatives and cells in this country based on calling patterns or connections between known targets and unknown associates.
In particular, whether the inability to publicise a person's identity will prevent further witnesses to a known offence from coming forward, or further unknown offences by the same person from coming to light.