The null finding may be real.
It may be the case that BWCs do not, in fact, affect the measured behaviors and the video footage does not affect the measured court outcomes.
To unpack this possible explanation a little further, we also conducted a time-series analysis (see the Working Paper) that tracks both the treatment and control groups over time. This analysis allows us to consider whether, for example, strong initial effects may have dissipated as officers became accustomed to the cameras. We find, however, that control and treatment group behaviors track closely together, both before and after the deployment of BWCs.