josh horwitz in washington, alan gottlieb from nashville, thank you. >> thank you. >> woodruff: thisbrought questions about police violence front and center once again, and has demonstrated the power of what's captured on video, frequently by citizens. the latest case: an arrest in san bernadino california that appeared to involve excessive force. today, ten deputies were placed on paid leave following the release of news video that recorded a violent arrest of a man who fled on horseback. it comes nearly a week after walter scott was shot in the back and killed by a police officer in north charleston, south carolina. his funeral is this weekend. hari sreenivasan has a report on efforts to document violence by video here and abroad. a warning: it contains images that are disturbing including the shooting of walter scott. everyone is shooting everything with camera phones (gunfire) >> the shooting of walter scott proves that sometimes video can be used as evidence against police wrongdoing. >> i think cameras in everyone's hands means that there will be more transparency and more acco