San Antonio Police Chief William McManus said the officer, Sergio Hernandez, was asked to finish his drink and leave Stacy's Bar on Blanco as it was closing early Thursday morning.
McManus said he was escorted out when he got angry and then kicked the door and knocked out the plexi-glass to the door.
Hernandez is assigned to the south patrol and is a 10-year veteran of the department. McManus said he will be referred to SAPD's Officer Concern Program.
"He'll be evaluated for what programs may help in this situation, but I think right now it's very early in the investigation. There's a lot to be learned as to whether he was inebriated or not," McManus said.
Hernandez was not in uniform at the time and has been placed on paid administrative leave.