A Coded identification crystal is a sub-dermal implant injected into all high-ranking Earthdome personnel as a precaution against kidnapping. The crystal emits a very low-level signal that can be detected over a short range by specialised hand held scanners.[1]

In 2259, ESID agent Derek Cranston attempted to track the fugitive Doctor Everett Jacobs on Babylon 5, providing B5 Security with the ID scanners to track down Jacobs.


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