believe that an investigation is needed, which has
been recognized by the United States Supreme
Court as an exception to the Fourth Amend-
ment’s search warrant requirement. This proce-
dure is also referred to as a “protective pat-down
search,” a “pat down for weapons,” or a “Terry stop
and frisk,” based on the Supreme Court decision
in T
ERRY V. OHIO, 392 U.S. 1, 19 (1968).
A law enforcement offi cer who has a reason-
able suspicion that a person is involved in criminal
activity may briefl y detain that person in order to
investigate his suspicion. If the offi cer has reason
to believe that the person is armed or dangerous,
or poses a threat to the safety of the officer or
bystanders, the offi cer is permitted to pat down
the outside of the person’s clothing to search for
concealed weapons. Under these circumstances,
the offi cer is not required to get a search warrant
before conducting the stop and frisk. However, the
search must be conducted in a reasonable manner.
If the offi cer detects a weapon while frisking the
person, the offi cer may disarm the person. If the
offi cer detects contraband during the pat-down
search, the offi cer may seize the contraband.
In Terry v. Ohio, 392 U.S. 1 (1968), the United
States Supreme Court approved this procedure
and established a test for evaluating future stop
and frisk procedures on a case-by-case basis.
Terry involved an undercover police offi cer who
observed two men alternately walk by a store win-
dow, peer inside, and then confer with each other.
They repeated this behavior fi ve or six times, and
then they conferred with a third man. Convinced
that the men were “casing” the store in prepara-
tion for a robbery, the offi cer suspected they were
armed with concealed weapons and decided to
investigate. He approached the three men, iden-
tified himself, and asked for their names. After
receiving mumbled responses, the offi cer grabbed
one of the men, Mr. Terry, spun him around, and
patted down the outside of his clothes. He felt a
handgun and reached into Mr. Terry’s pocket to
remove it. Mr. Terry was charged with carrying
a concealed weapon, and the pistol was used as
evidence against him at trial.
The Fourth Amendment to the Constitution
of the United States provides that “[t]he right of
the people to be secure in their persons, houses,
papers, and effects, against unreasonable searches
and seizures, shall not be violated, and no War-
rants shall issue, but upon probable cause.” The
United States Supreme Court granted review of
Mr. Terry’s case to answer the question of whether
the stop and frisk procedure violated the Fourth
Amendment’s prohibition of unreasonable searches
and seizures. To answer that question, the Court
decided that the reasonableness of the search was
best determined by balancing the police offi cer’s
interest in conducting the search against the
degree of invasion inflicted by the search. The
Court also stated that the frisk must be justifi ed
under the circumstances before being conducted
and that the frisk could be no more intrusive than
justified. Accordingly, the Court balanced the
reasonableness of the offi cer’s reasons for frisk-
ing the suspect and the manner in which the frisk
was carried out. Ultimately, the Supreme Court
approved of the frisk of Mr. Terry because the
offi cer was reasonable in his belief that Mr. Terry
and his associates were about to commit a crime,
that they were likely to be armed with concealed
weapons, and that they posed a threat to the safety
of others. The Court also approved of the frisk
because it was conducted in a very limited fashion,
was performed only to discover weapons, and was
not performed as a general search for evidence of
criminal activity.
After the Terry decision, a stop and frisk is per-
missible under the Fourth Amendment so long as
the offi cer has reasonable grounds for frisking the
suspect and the offi cer limits the frisk to a search
for weapons. In 1993, the Supreme Court further
clarifi ed the constitutionality of the stop and frisk
in the case of MINNESOTA V. DICKERSON, 508 U.S.
366 (1993). Under the “plain feel” doctrine, a law
enforcement offi cer may seize any other contra-
band—usually illegal drugs or drug parapherna-
lia—detected during a legitimate pat-down search
for weapons. However, for the seizure of the con-
traband to be valid under the Fourth Amendment,
its illegal character must be immediately apparent
to the offi cer based upon its contour or mass. Thus,
an offi cer is not allowed to manipulate the object
with his fingers in order to determine whether
704 stop and frisk
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