How long does it take to get BAC test results back after blood work drawn for possible DUI? I was stopped for possible DUI over six weeks ago. I had blood drawn at the hospital and was taken to the police station. I am still waiting for the results of the blood alcohol test. The policeman told me it could take up to a month and it is past a month. He said I would get a letter in the mail and I haven't received anything. Will I get notification even if my blood alcohol content was under the limits?