Drugs, crime, and public housing are closely linked in policy and politics, and their nexus has animated several intensive drug enforcement programs targeted at public housing residents. In New York City, police systematically conduct “vertical patrols” in public housing buildings, making tens of thousands of Terry stops each year. During these patrols, both uniformed and undercover officers systematically move through the buildings, temporarily detaining and questioning residents and visitors, often at a low threshold of suspicion, and usually alleging trespass to justify the stop. We use a case‐control design to identify the effects of living in one of New York City's 330 public housing developments on the probability of stop, frisk, and arrest from 2004–2011. We find that the incidence rate ratio for trespass stops and arrests is more than two times greater in public housing than in the immediate surrounding neighborhoods. We decompose these effects using first differences models and find that the difference in percent black and Hispanic populations in public housing compared to the surrounding area predicts the disparity in trespass enforcement and enforcement of other criminal law violations. The pattern of racially selective enforcement suggests the potential for systemic violations of the Fourteenth Amendment's prohibition on racial discrimination.

Drugs, crime and public housing are closely linked in policy and politics, and their nexus has animated several intensive drug enforcement programs targeted at public housing residents. In New York City, police systematically conduct "vertical" patrols in public, making tens of thousands of "Terry" stops to detect drugs or weapons each year under the Trespass Abatement Program, or TAP. Both uniformed and undercover officers move systemically within the halls and stairwells of buildings, temporarily detaining and questioning residents and visitors, often at a low threshold of suspicion, and usually alleging trespass to justify the stop.. This pattern of selective enforcement through elevated rates of high discretion stops in public housing under TAP raises constitutional concerns at the intersection of the Fourteenth Amendment prohibitions on racial discrimination-residents of public housing are overwhelming nonwhiteand Fourth Amendment prohibitions on suspicionless stops. We use a casecontrol design to identify the effects of living in a public housing development on the probability of stop, frisk and arrest for trespass or other crimes in New York City's330 public housing developments from 20058. We find that the incidence rate ratio for trespass stops and arrests is 1.5 times greater in public housing than in the immediate surrounding neighborhoods. We decompose these effects using first differences models and find that the difference in percent Black population in public housing compared to the surrounding area predicts the disparity in trespass enforcement. Fourwave cross lag regressions show that trespass enforcement in public housing is independent from enforcement in the surrounding area, suggesting that public housing is specifically targeted for intensive enforcement. The results raise constitutional concerns about equal protection. Qualitative evidence suggests that stops have a stigmatizing effect nd their families, and that they inhibit basic social e arrangements and family visitation. on public housing residents a interactions such as child car