The suspect, accused of committing war crimes in Suhareka in 1999, was issued a 30-day detention measure.
Citizens marched in support of former Kosovo PM and KLA commander Ramush Haradinaj, who was arrested in January on an international warrant issued by Serbia.
After a four-month investigation, the Kosovo Police Inspectorate has detained dozens of officers for felonies including abuse of office and bribery.
Hilmi Kelmendi, a Kosovo Albanian arrested on October 31 by the Serbian police under suspicion of war crimes, was released on Thursday.
After more than a month of detainment, Nehat Thaci was released today--only a day after another Kosovo Albanian was arrested on charges of war crimes in Serbia.