The Utah Supreme Court has recently made an effort to clarify the standard for determining when it is reasonable to conduct a protective frisk for weapons during the course of a traffic stop. The determination of whether there is a reasonable basis for conducting a frisk is an objective standard and the proposed justification is examined under the totality of the
circumstances.9 Having articulable or particularized suspicion means that the officer is able to point to specific facts in the particular case which, considered with rational inferences from those facts, reasonably warrant the belief that the suspect is armed and presently dangerous to the officer or others.10
The amount of evidence needed to rise to the level of articulable suspicion is no different in a traffic stop than in any other circumstance. However, some factors distinguish a traffic stop analysis from other circumstances. These factors can assist the officer, and later, the reviewing court in determining whether the articulable suspicion standard has been met.
First, the courts recognize that all traffic stops are inherently dangerous. This fact should be included in the totality of the circumstances analysis. Weighed against this factor should be any reduction in the danger inherent in a traffic stop that may result from ordering the person out of the vehicle before performing a frisk.11 Second, the officer’s subjective belief is also a factor to be considered in the totality of the circumstances used to determine if there was an objective basis for concluding that an individual sought to be frisked was armed and presently dangerous to
the officer or others. Of course, an officer’s subjective belief that a suspect may be armed, by itself will not justify a pat down Although not determinative, an officer's subjective belief may still be factored into the objective analysis. On the other hand, an officer’s lack of subjective belief that a suspect is armed will not end the inquiry. Due weight must be given, not to an officer's inchoate and unparticularized suspicion or “hunch,” but to specific reasonable inferences which an
officer is entitled to draw from the facts in light of his experience. This process allows officers to draw upon their own experience and training to make determinations based on the cumulative facts before them that may elude an untrained person.
The appellate courts have recognized a number of circumstances that rise to the level of
articulable suspicion justifying a pat down. These include: "a sudden and otherwise inexplicable move toward a pocket or other place where a weapon may be concealed;" a failure by the suspect "to respond to the officer's directive that he remove his hands from his pocket;" "a characteristic bulge in the suspect's clothing;" "a boisterous or aggressive attitude" by the suspect; "previously obtained information that this person carried a weapon;" or something "in addition to the minor offense" to suggest there is some reason "to suspect the individual of much more serious criminal
conduct" (such as a defendant driving a car with a missing license plate, running a stop sign in an area where a burglary was recently reported, or failing to provide any identification).12