同心圆理论

同心圆理论是系列性刑事案件三大侦查理论之一,源于城市结构模型理论,指的是以系列性案件的首发案为圆点、以信息源为依据、以到达系列性案件各子案发案地直线距离为半径,通过几何的方式勾画出犯罪人的活动半径,进而确定犯罪人的居住地和犯罪人的侦查方法。同心圆的原点是系列性案件的首发地,是信息源中元信息的集聚区,反映的是系列性案件中所有个案与首案之间的联系。圆半径的长短,反映了犯罪人对环境熟悉程度的变化,距离越短,其对环境的熟悉程度越高。同心圆理论解决了系列性案件侦查范围划分问题,有积极的实践意义。

Concentric Circles Theory

Concentric circles theory, one of the three theories on series criminal cases investigation, originated from urban structure mode theory, which refers to take the first one of the series cases as circle dot, the information source as the basis and the distances from the first case place to other cases places as radiuses, to draw the outline of the criminal＇ s action radius and then determine criminal＇ s identity and residence place. The circle dot, the con- centration of metainformation, reflects the connection between the first case and other cases. The length of the radi- us shows the extent of the criminal＇ s familiarity with environment. When the radius is shorter, the criminal will be more familiar with the environment. The concentric circles theory can deal with issue of the division of investigation scope, which is positive for investigation practice.