In the past couple of years defence lawyers have brought in more experts to challenge towerevidence, says Mr Jansen. Most police officers and lawyers have no clue how phone networksfunction, says Ryan Bialas, a North Dakota public defender. Cop shows like CSI give juriesthe idea that scientific evidence is almost infallible. But tower data is far less accurate thanprosecutors sometimes claim.
詹森说,在过去几年,辩护律师已经引进越来越多的专家来质疑发射塔证据。北达科他州公设辩护律师RyanBialas说,大部分警官和律师对手机网运行原理摸不着头脑。在警匪题材的剧集中,类似现场犯罪调查让陪审团信以为科学提供的证据几乎是不会出错的。但是发射塔的数据远没有检察官说的那样精准。
Location, location, location
定位,定位,定位
Cherry Biometrics, a Virginia forensics firm, has testified in more than 20 trials where towerevidence was being used. In all of them, says Michael Cherry, the boss, prosecutorsmisunderstood the technology. Often they would assert that mobile phones connect to thenearest tower. In fact, two calls dialled consecutively from the same spot may connect to twodifferent towers: one close by, the other many miles away. Defence lawyers sometimes use thesame junk science to support alibis, adds Mr Cherry.
Cherry Biometrics是一家位于弗吉尼亚州的取证公司。该公司老板迈克尔谢里证实,在20多个涉及发射塔证据的审判中,检察官误解了该项技术。通常情况下,该技术只是确定手机连接上了附近的发射塔。事实上,在同一个地方连续两次拨号有可能会连接两个不同的发射塔:一个是附近的,另一个可能是几英里远的。谢里先生补充道,辩护律师有时会使用相同的伪科学技术来支持不在场证明。
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