The tower cited in Ms Roberts s case could have handled calls from as far as 20 miles away, according to a deposition prepared by Cherry Biometrics. Which tower a phone connectswith depends on such factors as how thick the nearby foliage and walls are, the size of nearbycars and bodies of water, and how well the handset is working. None of this information isusually recorded.
Cherry Biometrics准备的一份证词中写道,本文引用的罗伯茨案件,其发射塔可服务范围可能是方圆20英里。手机连接发射塔有以下几个影响因素:附近的树叶有多浓密,墙有多厚,附近的车是大是小,水域是大是小,以及是否正常使用手机。这些影响因素从来就不会记录备份。
Without it, much of the tower evidence presented in court is useless, writes Larry Daniel ofGuardian Digital Forensics in a forthcoming book on the subject. Mr Daniel has found errors innearly half of the 240 consulting jobs he has done for prosecutors and defence lawyers. Evenso, tower records do have a place in court, says Mr Daniel: they can generally prove that ahandset has moved between broad areas such as non-adjacent cities.
卫报数字取证的拉里丹尼尔,在一本即将付梓的书中这样写道,....法庭上使用的大部分发射塔证据都是无效的。丹尼尔先生已经帮助检察官和辩护律师做过近240次咨询工作,他发现其中有一半都有问题。即使如此,发射塔的记录在法庭上还是有一席之地的,丹尼尔先生说,这些记录可以证明手机在宽广地区的移动情况,比如不相邻城市之间。
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