{"id":286652,"date":"2016-04-04T10:45:08","date_gmt":"2016-04-04T15:45:08","guid":{"rendered":"https:\/\/content.findlaw-admin.com\/ability-law\/dui\/arrests\/what-is-reasonable-suspicion-for-a-dui-stop.html"},"modified":"2026-04-13T12:25:37","modified_gmt":"2026-04-13T17:25:37","slug":"what-is-reasonable-suspicion-for-a-dui-stop","status":"publish","type":"page","link":"https:\/\/www.findlaw.com\/dui\/arrests\/what-is-reasonable-suspicion-for-a-dui-stop.html","title":{"rendered":"What is Reasonable Suspicion for a DUI Stop?"},"content":{"rendered":"\n
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What Is Reasonable Suspicion for a DUI Stop?<\/h1>\n\n
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\n By Hannah Hilst<\/a> | Legally reviewed by Meagan Neil, Esq.<\/a>\n | Last updated\n
\n \n <\/i>\n Legally Reviewed\n <\/summary>\n\n
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The last updated date refers to the last time this article was reviewed by FindLaw or one of our contributing authors<\/a>. We make every effort to keep our articles updated. For information regarding a specific legal issue affecting you, please contact an attorney in your area<\/a>.<\/em><\/p>\n\n <\/div>\n <\/details>\n<\/section>\n\n\n

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Reasonable suspicion is a legal standard that protects drivers’ due process rights. Police officers can only stop motorists when they have reasonable suspicion of criminal activity. This means every arrest for drunk driving begins with an officer’s suspicion of impairment. But the arresting officer might lack a valid reason for the initial stop. The driver could seek dismissal of the charges, even if they were driving while intoxicated (DWI).<\/p>\n\n <\/div>\n\n\n\n

An officer with reasonable suspicion that a crime has occurred can stop and briefly detain a person for a limited investigation. So, this rule applies when the officer suspects a motorist of driving under the influence (DUI).<\/p>\n

In that case, the officer can pull you over if they think you might be intoxicated. They will be looking for whether they have more evidence to support their suspicion. They will usually conduct a field sobriety test\u00a0or a\u00a0blood alcohol content (BAC) test<\/a>, also known as a Breathalyzer. This evidence could give them probable cause to arrest you.<\/p>\n

This article discusses what reasonable suspicion for a DUI stop requires. It also addresses the differences between reasonable suspicion and probable cause. In most states,\u00a0DUI or sobriety checkpoints<\/a>\u00a0remain a controversial exception to the rule.<\/p>\n

DUI\/DWI cases have serious consequences with a conviction. Get a DUI defense lawyer<\/a> to assess your options as soon after the arrest as possible. In some cases, challenging the underlying reason for the traffic stop can get the charges dismissed or dropped<\/a>.\u00a0<\/p>\n

Reasonable Suspicion in Criminal Law<\/h2>\n

The reasonable suspicion requirement for DUI stops stems from the Fourth Amendment<\/a> of the U.S. Constitution. It outlines your rights against unreasonable search and seizures<\/a> by law enforcement. This legal requirement applies when a police officer considers pulling over someone<\/a> on the road.\u00a0<\/p>\n

Yet, the definition of “reasonable” can be vague. It depends on the specific context of the case. While there are many common reasons for DUI stops, reasonable suspicion can involve a wide range of factors.\u00a0<\/p>\n

Examples of Reasonable Suspicion for a DUI Stop<\/h2>\n

Reasonable suspicion that a motorist is impaired can be established by any of the following observations:<\/p>\n