The shooting was recorded on video by several bystanders, sparking numerous violent protests in the city over what many claimed was police brutality. Mehserle was convicted of involuntary manslaughter.
Oliver, a former Cleveland police chief, told the transit board that he thought BART police had a dysfunctional culture nearly five years ago from outdated policies and inadequate training, supervision and accountability.
"One of axioms to live by is that you can expect what you inspect, if you're not inspecting things then it probably won't go as well," Oliver said.
Oliver wants BART police to make even more changes, including the implementation of a computerized tracking system that provides early warnings if officers are having problems.
BART Police Chief Kenton Rainey said the department has adopted a majority of the reforms and officers now receive 40 hours of training every year — compared to the state standard of 24 hours every two years. The training involves use of force, he said.
"The officers like the training because it gives them more confidence when handling volatile incidents, it also keeps them updated and abreast on changes with the law," Rainey said. "The support we have received has made it easier for me to accept the recommendations and use it as a blueprint to move this organization forward."