According to one site, the April police check of Elliot Rodger, the Santa Barbara butcher, was because of the videos he had posted, but the police never watched those videos:
Santa Barbara Sheriff's deputies checking on Elliot Rodger weeks before he killed six college students were aware of but didn't view disturbing videos that prompted calls about his well-being.
That is not good policing, right? Those videos are the evidence which made Rodger's family concerned.