Campaign to Prevent Violent Traffic Stops Tells Drivers to Keep Cool

"The ads also stop short of fully explaining the rights of a citizen in a traffic stop, according to Harlan Yu, the executive director of Upturn, a nonprofit that studies how technology affects social issues.

“One thing that I think is missing from this is how somebody who does get stopped, where the officers are wearing body-worn cameras, how that person is able to get body-worn camera video,” Mr. Yu said."