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Ground-based measurements will be a crucial part of the global study of Earth , since some effects cannot be detected by remote sensing from space . Protocol I prohibits the use of any weapon designed to wound or kill with small fragments that cannot be detected by x-rays . An alternative is to shield the area in which the information is processed so as to contain electromagnetic emanations or to specify control of certain distances or zones beyond which the emanations cannot be detected . Fetishes are set up to punish offenders in certain cases where it is considered specially desirable to make the law operative though the crimes cannot be detected ( e.g .