Brief description
Maja implanted a fake biometric wrist implant into Katarina, in case she was ever scanned by a "city trenchcoat" (an investigator injected with Blue, like Vera). Katarina didn't know that the implant was fake biometric data until after its insertion. Only towards the conclusion of the videogame does Vera find out that she's been fooled, through listening to an audio recording discussing the fake implant.