I cited 2 cases that cover it. There are more.
i hope this wasn't what you call support
While concern for safety during
a routine traffic stop may justify the “minimal” additional intrusion of
ordering a driver and passengers out of the car, it does not by itself
justify the often considerably greater intrusion attending a full fieldtype
search. Even without the search authority Iowa urges, officers
have other, independent bases to search for weapons and protect themselves
from danger.
This is not to say that the concern for officer safety is
absent in the case of a routine traffic stop. It plainly is not.
See Mimms, supra, at 110; Wilson, supra, at 413–414. But
while the concern for officer safety in this context may justify
the “minimal” additional intrusion of ordering a driver
and passengers out of the car, it does not by itself justify the
often considerably greater intrusion attending a full fieldtype
search. Even without the search authority Iowa urges,
officers have other, independent bases to search for weapons
and protect themselves from danger. For example, they
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118 KNOWLES v. IOWA
Opinion of the Court
may order out of a vehicle both the driver, Mimms, supra,
at 111, and any passengers, Wilson, supra, at 414; perform
a “patdown” of a driver and any passengers upon reasonable
suspicion that they may be armed and dangerous, Terry v.
Ohio, 392 U. S. 1 (1968); conduct a “Terry patdown” of the
passenger compartment of a vehicle upon reasonable suspicion
that an occupant is dangerous and may gain immediate
control of a weapon, Michigan v. Long, 463 U. S. 1032, 1049
(1983);
the case dealt with the concept of a full search, and that didn't happen here. it also addressed and affirmed the right/ability of the cops to order folks outa the car and secure any weapons. i don't see it saying they can't run the numbers while they have em.