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一位老人在家人的眼皮底下遭到枪杀,子弹从何而来,无人知晓,警察怎样才能找到凶手呢?怎样才能判别开枪是出于正当防卫呢?刑侦专家能够判别谁是谁非吗?一把手枪只需一秒钟便能置人于死地,而侦破案件却是要花费时日,随着破案速度的增快以及技术的专业化和精确化,刑侦专家们已经牢牢地盯住了致人死命的目标。