Mr. Friend is a
crime analyst
with the Santa
Cruz, California,
Police
Department.
Predictive Policing: Using Technology to Reduce Crime
By Zach Friend, M.P.P.
4/9/2013
Nationwide law enforcement agencies face the problem
of doing more with less. Departments slash budgets
and implement furloughs, while management struggles
to meet the public safety needs of the community. The
Santa Cruz, California, Police Department handles the
same issues with increasing property crimes and
service calls and diminishing staff. Unable to hire more
officers, the department searched for a nontraditional
solution.
In late 2010 researchers published a paper that the
department believed might hold the answer. They
proposed that it was possible to predict certain crimes,
much like scientists forecast earthquake aftershocks.
An “aftercrime” often follows an initial crime. The time and location of previous criminal activity helps to
determine future offenses. These researchers developed an algorithm (mathematical procedure) that
calculates future crime locations.1
Equalizing Resources
The Santa Cruz Police Department has 94 sworn officers and serves a population of 60,000. A
university, amusement park, and beach push the seasonal population to 150,000. Department personnel
contacted a Santa Clara University professor to apply the algorithm, hoping that leveraging technology
would improve their efforts. The police chief indicated that the department could not hire more officers.
He felt that the program could allocate dwindling resources more efficiently.
Santa Cruz police envisioned deploying officers by shift to the most targeted locations in the city. The
predictive policing model helped to alert officers to targeted locations in real time, a significant
improvement over traditional tactics.
Making it Work
The algorithm is a culmination of anthropological and criminological behavior research. It uses complex
mathematics to estimate crime and predict future hot spots. Researchers based these studies on
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Patch Call
Known locally as the
“Gateway to the Summit,”
which references the city’s
proximity to the Bechtel Family
National Scout Reserve. More
The patch of the Miamisburg,
Ohio, Police Department
prominently displays the city
seal surroun.