Thomas, J.
After a 911 caller reported that a vehicle had run her off the road, a police officer located the vehicle she identified during the call and executed a traffic stop. We hold that the stop complied with the Fourth Amendment because, under the totality of the circumstances, the officer had reasonable suspicion that the driver was intoxicated.
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The initial question in this case is whether the 911 call was sufficiently reliable to credit the allegation that petitioners’ truck “ran the [caller] off the roadway.” Even assuming for present purposes that the 911 call was anonymous, see n. 1, supra, we conclude that the call bore adequate indicia of reliability for the officer to credit the caller’s account. The officer was therefore justified in proceeding from the premise that the truck had, in fact, caused the caller’s car to be dangerously diverted from the highway. By reporting that she had been run off the road by a specific vehicle—a silver Ford F-150 pickup, license plate 8D94925—the caller necessarily claimed eyewitness knowledge of the alleged dangerous driving. That basis of knowledge lends significant support to the tip’s reliability. . . . .
There is also reason to think that the 911 caller in this case was telling the truth. Police confirmed the truck’s location near mile marker 69 (roughly 19 highway miles south of the location reported in the 911 call) at 4:00 p.m.(roughly 18 minutes after the 911 call). That timeline of events suggests that the caller reported the incident soon after she was run off the road. That sort of contemporaneous report has long been treated as especially reliable. . . . .
Another indicator of veracity is the caller’s use of the 911 emergency system. See Brief for Respondent 40–41,44; Brief for United States as Amicus Curiae 16–18. A 911 call has some features that allow for identifying and tracing callers, and thus provide some safeguards against making false reports with immunity. See J. L., supra, at 276 (KENNEDY, J., concurring). As this case illustrates, see n. 1, supra, 911 calls can be recorded, which provides victims with an opportunity to identify the false tipster’s voice and subject him to prosecution, see, e.g., Cal. Penal Code Ann. §653x (West 2010) (makes “telephon[ing] the 911 emergency line with the intent to annoy or harass” punishable by imprisonment and fine); see also §148.3(2014 West Cum. Supp.) (prohibits falsely reporting “that an ‘emergency’ exists”); §148.5 (prohibits falsely reporting “that a felony or misdemeanor has been committed”). The 911 system also permits law enforcement to verify important information about the caller. In 1998, the Federal Communications Commission (FCC) began to require cellular carriers to relay the caller’s phone number to 911 dispatchers. 47 CFR §20.18(d)(1) (2013) (FCC’s “Phase I enhanced 911 services” requirements). Beginning in 2001, carriers have been required to identify the caller’s geographic location with increasing specificity. §§20.18(e)–(h) (“Phase II enhanced 911 service” requirements). And although callers may ordinarily block call recipients from obtaining their identifying information, FCC regulations exempt 911 calls from that privilege. §§64.1601(b),(d)(4)(ii) (“911 emergency services” exemption from rule that, when a caller so requests, “a carrier may not reveal that caller’s number or name”). None of this is to suggest that tips in 911 calls are per se reliable. Given the foregoing technological and regulatory developments, however, a reasonable officer could conclude that a false tipster would think twice before using such a system. The caller’s use of the 911 system is therefore one of the relevant circum stances that, taken together, justified the officer’s reliance on the information reported in the 911 call.
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The 911 caller in this case reported more than a minor traffic infraction and more than a conclusory allegation of drunk or reckless driving. Instead, she alleged a specific and dangerous result of the driver’s conduct: running another car off the highway. That conduct bears too great a resemblance to paradigmatic manifestations of drunk driving to be dismissed as an isolated example of recklessness. Running another vehicle off the road suggests lane positioning problems, decreased vigilance, impaired judgment, or some combination of those recognized drunk driving cues. See Visual Detection of DWI Motorists 4–5. And the experience of many officers suggests that a driver who almost strikes a vehicle or another object—the exact scenario that ordinarily causes “running [another vehicle] off the roadway”—is likely intoxicated. See id., at 5,8. As a result, we cannot say that the officer acted unreasonably under these circumstances in stopping a driver whose alleged conduct was a significant indicator of drunk driving.
Petitioners’ attempts to second-guess the officer’s reasonable suspicion of drunk driving are unavailing. It is true that the reported behavior might also be explained by, for example, a driver responding to “an unruly child orother distraction.” Brief for Petitioners 21. But we have consistently recognized that reasonable suspicion “need not rule out the possibility of innocent conduct.” United States v. Arvizu, 534 U. S. 266, 277 (2002).
Nor did the absence of additional suspicious conduct,after the vehicle was first spotted by an officer, dispel the reasonable suspicion of drunk driving. Brief for Petitioners 23–24. It is hardly surprising that the appearance of a marked police car would inspire more careful driving for a time. Cf. Arvizu, supra, at 275 (“‘[s]lowing down afterspotting a law enforcement vehicle’” does not dispel reasonable suspicion of criminal activity). Extended observation of an allegedly drunk driver might eventually dispel a reasonable suspicion of intoxication, but the 5-minute period in this case hardly sufficed in that regard. Of course, an officer who already has such a reasonable suspicion need not surveil a vehicle at length in order to personally observe suspicious driving. See Adams v. Williams, 407 U. S., at 147 (repudiating the argument that “reasonable cause for a[n investigative stop] can only be based on the officer’s personal observation”). Once reasonable suspicion of drunk driving arises, “[t]he reasonableness of the officer’s decision to stop a suspect does not turn on the availability of less intrusive investigatory techniques.” Sokolow, 490 U. S., at 11. This would be a particularly inappropriate context to depart from that settled rule, because allowing a drunk driver a second chance for dangerous conduct could have disastrous consequences.
ROBERTS, C. J., and KENNEDY, BREYER, and ALITO, JJ., joined. SCALIA, J., filed a dissenting opinion, in which GINSBURG, SOTOMAYOR, and KAGAN, JJ., joined:
The Court’s opinion serves up a freedom-destroying cocktail consisting of two parts patent falsity: (1) that anonymous 911 reports of traffic violations are reliable so long as they correctly identify a car and its location, and (2) that a single instance of careless or reckless driving necessarily supports a reasonable suspicion of drunkenness. All the malevolent 911 caller need do is assert a traffic violation, and the targeted car will be stopped, forcibly if necessary, by the police. If the driver turns out not to be drunk (which will almost always be the case), the caller need fear no consequences, even if 911 knows his identity. After all, he never alleged drunkenness, but merely called in a traffic violation—and on that point his word is as good as his victim’s.
Drunken driving is a serious matter, but so is the loss of our freedom to come and go as we please without police interference. To prevent and detect murder we do not allow searches without probable cause or targeted Terry stops without reasonable suspicion. We should not do so for drunken driving either. After today’s opinion all of us on the road, and not just drug dealers, are at risk of having our freedom of movement curtailed on suspicion of drunkenness, based upon a phone tip, true or false, of a single instance of careless driving. I respectfully dissent.