Four officers arrest man; while his head is pinned to the ground, one of the officers kicks him in the face, breaking his nose and eye socket. Each officer denies doing it or seeing it. (A dashcam does not record.) Third Circuit: He can’t sue for excessive force because he doesn’t know which officer kicked him. But he can sue the officers for conspiring to cover up misconduct, an act that deprives him of access to the courts.