Mayor Daley assigned Weis in 2008 to crack down on officer misconduct after several scandals marred the department, the Sun-Times reports.
The police superintendent filed 62 disciplinary cases over three years with the nine-member Police Board. That falls short of the 106 cases his predecessors filed three years before his tenure started.
According to his spokesperson, Weis interpreting fewer cases is a sign officers are getting the message to clean up their act.
"First and foremost, this is a positive," Lt. Maureen Biggane told the paper. "The superintendent has pushed for a more professional police department, and one could make the argument his message is being well received."
Some critics argued officers are hitting the streets less aggressively, fearing their superintendent won't come to their aid if accused of wrongdoing.
Mayor Daley said Weis will remain at the department's helm after his contract ends in March until the new mayor takes over in May.