Police let most Capitol rioters walk away. But cellphone data and videos could now lead to more arrests.

Phone records make determining the owners of these devices trivially easy. Congressional investigators and federal prosecutors can also identify devices and users who may have connected wittingly or automatically to Congressional guest WiFi networks — unless rioters made a point of deactivating their devices or leaving them behind during the takeover.The countless hours of video — much of it taken by the rioters themselves and uploaded to social media — also offers an ideal set for facial recognition.