Here's their important last paragraph:
The data presented here suggest that, although police officers
may be affected by culturally shared racial stereotypes (i.e., showing
bias in their response times), they are no more liable to this bias
than are the people who live and work in their communities.
Further, at least on the simulation used here, the officers’ ultimate
decisions about whether or not to shoot are less susceptible to
racial bias than are the decisions of community members. The data
suggest that the officers’ training and/or expertise may improve
their overall performance (yielding faster responses, greater sensitivity
and reduced tendencies to shoot) and decrease racial bias in
decision outcomes. We feel that this research represents a valuable
melding of basic social psychological processes with an issue of
great importance to our society. By examining the influence of
race in the automatic processing of danger-related stimuli, and the
capacity of expertise to moderate this effect, these findings touch
on a topic of great interest to social psychologists, sociologists,
police, and community groups, alike. The investigation of racial
bias in police use of force presents a unique opportunity to apply
experimental social psychological methods to an issue that is vital
to the members of increasingly diverse neighborhoods and communities
------ I would think that this should negate the tin foil hat view of the research.