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DALLAS — A white Dallas police officer who fatally shot her black neighbor in his apartment last year had no drugs or alcohol in her system at the time, a police detective testified Tuesday.

Detective Eddie Ibarra’s testimony during the second day of Amber Guyger’s murder trial marked the first time her toxicology results have been publicly revealed.

Guyger was off duty but in uniform when she shot Botham Jean last September. Guyger has said she mistook his apartment for her own.

Prosecutors have said Guyger should have noticed she was on the wrong floor, and contend she was distracted by a phone and text conversation with a colleague with whom she had a sexual relationship. Guyger’s attorneys have argued that she fired in self-defense based on the mistaken belief that she was in her home and that Jean was a burglar.

Jurors heard her frantic call to 911 following the shooting. In the call, Guyger says “I thought it was my apartment” nearly 20 times. She also says: “I’m gonna lose my job” and “I am going to need a supervisor.” The recording of the 911 call was previously obtained by a Dallas TV station.

Prosecutors said Monday that 26-year-old Jean, an accountant who grew up in the Caribbean nation of St. Lucia, was sitting in his living room, eating a bowl of vanilla ice cream, when Guyger, 31, walked into his home and shot him.

Jurors on Tuesday watched body camera footage from Officer Michael Lee, who was among the responders to the shooting. Guyger, who was later fired from the force, looks panicked when she appears briefly in Lee’s footage. In it, Guyger says, “I thought it was my apartment. I thought it was my apartment,” as Lee moves past her and puts on a pair of gloves.

Lee testified that despite officers’ efforts, Jean didn’t open his eyes or otherwise communicate with first responders.

Senior Cpl. Dale Richardson testified that he was told during the investigation that Guyger’s set of keys were found dangling from Jean’s door. He said that when tested, Guyger’s key made a light on the lock blink red and it would not operate, while Jean’s key made the lock blink green, made a whirring sound and allowed it to operate.

Guyger’s defense has said she was able to enter the apartment because the door wasn’t locked.