An internal affairs investigation into the fatal crash involving Officer David Bisard found no evidence of a cover-up within the department, 6News has learned.The report is expected to be released Wednesday, but sources who have seen the document told 6News' Jack Rinehart that it may fuel even more controversy surrounding the Aug. 6 crash.Police said Bisard was drunk on duty when he plowed into a group of motorcyclists stopped at a red light, killing one and severely injuring two others.The police department's investigation into the incident quotes fellow officers, firefighters, ambulance personnel and the doctor who examined Bisard. All said they did not suspect that the officer had been drinking, sources said.Sources also said that an FBI report on the incident shows that agents called into the investigation by Public Safety Director Frank Straub questioned why police treated the incident as an accident scene, rather than a crime scene.Both the FBI and the internal investigation report found no fault with the handling of the incident by three deputy chiefs who responded to the scene and were demoted in the aftermath of the investigation, sources said.The FBI report has been forwarded to the U.S. Department of Justice. It's unclear if its findings will ever be made public.Alcohol-related charges against Bisard were dropped after it was determined that a blood draw, which showed he had a blood-alcohol level of 0.19 percent two hours after the crash, was obtained illegally.Marion County Prosecutor Carl Brizzi has filed to reintroduce the flawed blood alcohol test to support a charge of reckless homicide against Bisard.Bruce Kehoe, attorney for Kurt Weekly, one of the victims of the crash, said the conclusions of the internal report are insignificant."I'd rather draw my own conclusions. It's the transcript of the interviews. It's the transcript of the radio transmissions. It's the information that's important," Kehoe said. "Conclusions are in the eye of the beholder."Kehoe said he thinks that the report will be damning to the department, either way."Either it's a comedy of errors and an incompetent investigation, or it's something worse -- it's a cover-up," he said. "Had it been a member of the public at large, it would have been treated as a crime."Eric Wells was killed in the crash. Weekly and Mary Mills were injured. Weekly was recently released from a rehabilitation hospital.