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13 Am. J. Police 37 (1994)
Police Perceptions of Street-Level Narcotics Activity: Evaluating Drug Buys as a Research Tool

handle is hein.journals/ajpol13 and id is 357 raw text is: American Journal of Police Vol. XIII, No. 3 1994 37

POLICE PERCEPTIONS OF STREET-LEVEL
NARCOTICS ACTIVITY: EVALUATING DRUG
BUYS AS A RESEARCH TOOL
Anthony A. Braga
Rutgers University
Lorraine A. Green
Northeastern University and Rutgers University
David L. Weisburd
Hebrew University and Rutgers University
Frank Gajewski
Jersey City Police Department
Like professionals in other occupations, police officers de-
velop particular ways of perceiving their work environment. As Bittner
(1970) suggests, some officers know the shops, stores, warehouses,
restaurants, hotels, schools, playgrounds, and other public places in
such a way that they can recognize at a glance whether what is going
on within them is within the range of normalcy (1970: 90). In many
cases, a police officer's view of the world derives from a distinct per-
spective developed from the danger and authority inherent in their role
(Brown, 1981). Working in hostile environments, some scholars argue
that police officers are especially attentive to signs of potential crime
and that a relationship exists between the occupational environment of
police officers and the manner in which they interpret situations and
events (see Bittner, 1970; Krause, Reiss, 1971; Skolnick, 1966). Con-
versely, other scholars argue that practitioners' perceptions are subjec-
tive (see for example, Fagan, 1990; Monahan, 1981) and are thus unre-
liable measures of criminal activity.
This paper examines police perceptions of drug activity at
street-level drug markets in Jersey City, New Jersey. In particular, the
paper explores whether police perceptions of drug market activity are a
reliable and valid method for measuring levels of drug activity in street

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