Authorities say a Tempe school resource officer accidentally fired her department-issued Taser during a demonstration, striking a student in the arm with one probe.
Tempe police say the female officer was doing a show-and-tell Friday afternoon for an eighth-grade class at Gilliland Middle School.
They say she pushed a button that tests whether the Taser is working.
Police say the officer then mistakenly pulled the trigger and one of the two probes hit a 14-year-old girl in the left arm.
Since the other probe went into a wall, police say no electrical current was delivered and the student wasn't shocked.
However, the student was taken to a hospital where she had the probe removed.
Police say the resource officer has been removed from the school while the incident is investigated.