Not convincing. The inherent limitations and flaws in this Schell’s measurements makes the results inconclusive: “In approximately one-quarter of the recordings, either the video or the audio was of poor quality (e.g., camera was not aimed so that driver and officer were in the field of view, or the audio quality would not allow coders to understand the driver). The number of cases in which the video record was not complete (omitting either the beginning or end of an incident) dropped to 3 percent…The fact that an effect is not significant within every year’s data should not be interpreted as a change in police or driver behavior across years but as an inherent limitation of working with a random sample of 300 incidents. Analyses of the communication variables have somewhat less power, due to the incomplete data caused by inaudible audio…The actual content and quality of the recordings presented real limitations on what measures could be reliably extracted from these interactions. Specifically, the single camera position (almost always 30–50 feet behind the stopped driver); low video resolution; single, lapel-style microphone on the officer; and high ambient noise limited the measurements that could be taken from analysis of the recordings.”
Not convincing. The inherent limitations and flaws in this Schell’s measurements makes the results inconclusive: “In approximately one-quarter of the recordings, either the video or the audio was of poor quality (e.g., camera was not aimed so that driver and officer were in the field of view, or the audio quality would not allow coders to understand the driver). The number of cases in which the video record was not complete (omitting either the beginning or end of an incident) dropped to 3 percent…The fact that an effect is not significant within every year’s data should not be interpreted as a change in police or driver behavior across years but as an inherent limitation of working with a random sample of 300 incidents. Analyses of the communication variables have somewhat less power, due to the incomplete data caused by inaudible audio…The actual content and quality of the recordings presented real limitations on what measures could be reliably extracted from these interactions. Specifically, the single camera position (almost always 30–50 feet behind the stopped driver); low video resolution; single, lapel-style microphone on the officer; and high ambient noise limited the measurements that could be taken from analysis of the recordings.”