Understanding the role of street network configurations in the placement of illegitimately operating facilities

The role of street networks in shaping the spatial distribution of crime has become a foundational component within environmental criminology. Most studies, however, have focused on opportunistic crime types, such as property offenses. In this study, we instead research a theoretically distinct phenomenon by examining the placement of venues that host criminal activity. In particular, we study the relationship between network structure and the placement of illicit massage businesses, which operate on the intersections of illicit and legitimate activity by hosting illicit commercial sex under the guise of legitimate massage. We model their placement as a function of two network metrics: betweenness, which measures a street's usage potential, and a variant called “local betweenness,” which measures the potential of nearby streets. Multilevel models are used to examine the importance of these street-level metrics while accounting for tract-level covariates. Our findings demonstrate that, unlike property crimes, illicit massage businesses tend to be located on streets that are themselves quiet but that are close to areas of high activity. Such locations seem to combine accessibility and discretion, and therefore, represent ideal conditions for such businesses to thrive. Our findings can inform problem-oriented approaches to prevent the harms associated with illegitimately operating businesses.