Capitol attack: FBI mum on facial recognition, Clearview AI searches spike BLM protesters were subject to surveillance, but feds aren't saying whether they're using the same tools to investigate riots Listen - 07:42 The FBI sought the public's help to identify those involved in Wednesday's violence at the US Capitol. ev Radin/Pacific Press/LightRocket via Getty Images The FBI isn't saying whether it is using facial recognition technology to identify suspects involved in the Capitol attack on Wednesday. Neither are any of the other seven agencies CNET reached out to over the weekend. Even so, facial recognition app Clearview AI has confirmed a spike in searches of its database used by law enforcement.