The corruption of a jury is so that a desired verdict is reached. The number of jurors corrupted varies from country to country depending on the number needed for a guilty verdict. Jurors may be influenced through bribery, threats to the timid, pleas of innocence to the impressionable (usually by an attractive member of the opposite sex), the trial judge, or pleas of being falsely accused to the anti-establishment.
Police estimate that in London alone as many as 12 cases a year are halted and re-tried because jury nobbling has been discovered. There is no estimate of the number of trials in which nobbling remains undetected.