NELOS – Network Event Location System by AT&T

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NELOS – Network Event Location System, was developed by AT&T and provides location information for cellular devices within their network.  Law Enforcement has become aware of this data and routinely requests it in Search Warrants when obtaining CDRs (Call Detail Records) of a subscriber.  Prosecutors are attempting to submit this data as accurate and reliable without any supporting documentation from AT&T to substantiate their data. In fact, the following disclaimer is on every page of the report.

The results provided are AT&T’s best estimate of the location of the target number. Please exercise caution in using these records for investigative purposes as location data is sourced from various databases which may cause location results to be less than exact.

If you are litigating or defending a client where NELOS data is being used and you need an expert on cellular technology, contact RMCF