Statistical calculations regarding multiple fragment hits have been performed and applied to a number of typical existing and recently developed fragmentation warheads. This has made it possible to formulate a rule intended to obstruct the use of certain warhead types which may be considered to give rise to a high rate of superfluous injury. The rule is not entirely contradictory to the demands for higher warhead efficacy and cost-efficiency. A futher study of the implications of the rule, and of possible ways to improve it, should be performed.