The academy, based at Camp Dodge in Johnston, trains law enforcement officers, jailers and dispatchers. It offers a 14-week basic training course and others throughout the year.
As the AP reported last week, the investigation was prompted by complaints from female academy students who said Quinn singled them out to ask whether "penis size mattered" in a sex abuse investigation class. Brady filed a complaint with DAS, which conducted an investigation.
The investigation confirmed Quinn made those remarks, which Ciechanowski's letter said were "counterproductive to an effective learning environment" because they embarrassed and offended students. There were better ways to make a point about interviewing assault victims, he told Quinn.
The investigation also confirmed that Quinn told Brady in August 2012 that he would "slit your throat" if she did not stay away from another employee at the academy's front desk. The statement, which Brady has on tape, "doesn't foster an environment of respect and professionalism," Ciechanowski wrote.
The investigation also found Quinn made at least two statements to colleagues and students about his testicles after he had received a vasectomy, including that, "I got my nuts cut and have them on ice," and "I got my package on ice."
"These comments were unprofessional and clearly don't belong in today's work environment," Ciechanowski wrote.
Quinn also made comments about his sex life when he introduced himself to students that were "unnecessary, inappropriate, and counterproductive." Ciechanowski's letter didn't elaborate. But Brady has alleged that the comments referred to Quinn discussing his relationship with Trisha Conrad, 36, a former academy employee who is now his wife.
Quinn declined comment. Ciechanowski said he followed DAS recommendation in opting to warn Quinn rather than give an unpaid suspension.
Ciechanowski had praised Quinn in an interview last week, calling him a talented administrator with great budgeting skills and valuable experience as the former police chief in Newton. Quinn began working at the academy as an instructor in 2000, and Ciechanowski made him his assistant director in 2011.