Officer Stephen P. Burtis appeals the district court’s 1 denial of his motion for summary judgment on the basis of qualified immunity. Burtis arrested Karla Kaye Kuehl at the Metro Boutique in Sioux Falls, South Dakota. Kuehl owns and manages the Boutique and was arrested by Burtis after an altercation in the store with Ezekial James McBeth. Burtis arrested Kuehl for simple assault, and Kuehl later sued Burtis under 42 U.S.C. § 1983 for arresting her without probable cause. We affirm the judgment of the district court.
I.
As we review a motion for summary judgment, we view the evidence in the light most favorable to Kuehl, the non-moving party.
Resolution Trust Corp. v. Armbruster,
Burtis was dispatched to the scene along with two or three other members of the Sioux Falls Police Department. He interviewed McBeth, McBeth’s brother and two friends, an employee of Kuehl’s named Doris Gunsolus, and two shoppers in the store. All of them stated that Kuehl struck McBeth on the face, and Burtis observed some “very slight bruising” on McBeth’s face. Gunsolus tried to retract her statement that Kuehl had slapped McBeth, but Burtis ignored this retraction and omitted it from his police report. Meanwhile, Burtis spoke to Kuehl for only about twenty seconds. Kuehl explained to Burtis that McBeth had hit her, that she had feared for her safety, and that she pushed him out of the way so that she could reach a telephone and call the police. Despite the pronounced bruising on Kuehl’s face, Burtis refused to speak further with her, and he omitted Kuehl’s version of events from his police report. Further, Lakdhar — the only witness who saw the entire altercation between Kuehl and McBeth — attempted to explain to Burtis what had transpired between Kuehl and McBeth, but Burtis indicated that he was not interested in what Lakdhar had to say, declined to interview Lakdhar, and made no mention of Lakdhar’s account in the police report. Throughout his investigation, Burtis ignored the circumstances that would have explained why Kuehl struck McBeth or that would have shown that McBeth’s injuries occurred inadvertently *649 when Kuehl tried to push him away from her.
Having once more told Kuehl that he would not listen to her, and that, “I’ve made up my mind,” Burtis arrested her for simple assault. In relevant part, South Dakota law defines simple assault as: “attempting] to cause bodily injury to another ... [with] the actual ability to cause the injury” as well as “intentionally causing] bodily injury to another which does not result in serious bodily injury.” S.D. Codified Laws § 22-18-1 (1988 Rev.). Burtis took Kuehl to the Minnehaha County Jail, where she was detained for two or three hours until her husband posted bail. State prosecutors eventually reduced the charge to disorderly conduct. When McBeth failed to appear at Kuehl’s trial and after Gunsolus informed the prosecutor that Burtis’s police report was inaccurate, the charges against Kuehl were dropped.
This lawsuit followed. Kuehl sued Bur-tis, Sioux Falls Police Chief Terry Satter-lee, the City of Sioux Falls, and other-unnamed officers under 42 U.S.C. § 1983, alleging that Burtis arrested her without probable cause. 3 The officers and the City moved for summary judgment and argued that Burtis was shielded from liability by virtue of qualified immunity. The district court denied the motion, and the officers and the City appealed. 4
II.
Kuehl challenges our jurisdiction to review the district court’s order. We reject this challenge, but we must first establish our jurisdiction to hear the case. When a district court’s denial of a claim of qualified immunity turns upon an issue of law, it is an appealable “final decision.”
See Mitchell v. Forsyth,
III.
In determining whether the district court should have granted summary judgment on the basis of qualified immunity, we must consider whether Kuehl has alleged a violation of a clearly-established constitutional right and whether a reasonable officer in Burtis’s position would have known that his actions violated that right.
Merritt v. Reed,
Probable cause exists when the totality of circumstances demonstrates that a prudent person would believe that the arrestee has committed or was committing a crime.
United States v. Washington,
Second and relatedly, law enforcement officers have a duty to conduct a reasonably thorough investigation prior to arresting a suspect, at least in the absence of exigent circumstances and so long as “law enforcement would not [be] unduly hampered ... if the agents ... wait[ ] to obtain more facts before seeking to arrest.”
See United States v. Woolbright,
Under these standards, we cannot conclude that Burtis is entitled to qualified immunity. First, Burtis ignored plainly exculpatory evidence that negated the intent required for simple assault. Kuehl explained to Burtis that she pushed McBeth out of the way so that she could telephone the police, and Burtis observed the sizeable bruise over her left eye. Burtis also knew that Kuehl had asked McBeth to leave the store, and he was told that McBeth hit Kuehl with considerable force. He also ignored Gunsolus’s efforts to retract her statement that Kuehl had slapped McBeth, and his report made no mention of this retraction. Evidence known to Burtis therefore suggested that Kuehl neither “attempt[ed] to cause bodily injury”' nor “intentionally caus[ed] bodily injury.” See S.D. Codified Laws § 22-18-1. Second, Burtis refused to interview Lakdhar despite Lakdhar’s having witnessed the entire altercation between Kuehl and McBeth. Lakdhar’s account would have further exonerated Kuehl and negated probable cause. Third, a more thorough interview of Kuehl and Lakdhar would not have unduly hampered the process of law enforcement. Burtis was accompanied by at least two other Sioux Falls police officers, and the record presents no indication that exigent circumstances precluded a more thorough investigation by Burtis and his colleagues.
Substantial eyewitness testimony may have indicated that Kuehl assaulted McBeth, but this evidence neither relieved Burtis of the duty to conduct a reasonable investigation nor permitted him to ignore exculpatory evidence within his knowledge. The judgment of the district court is affirmed.
Notes
. The Honorable John B. Jones, Senior United States District Judge for the District of South Dakota.
. McBeth is 6’2” to 6’3” in height and weighs 220 pounds, while Kuehl is 5'9" tall and weighs 160 pounds.
. Kuehl also sued McBeth for assault and battery, but McBeth is not a party to this appeal.
. Although Salterlee and the City of Sioux Falls appeal the judgment below, only Bur-tis’s conduct is relevant to this appeal.
