In any large community, there will inevitably be a few bad apples thrown into the bunch. IU is no different. Luckily, Bloomington has two police departments to help keep residents safe--the Indiana University Police Department and the Bloomington Police Department. There's also an Indiana State Police station just outside of campus for Monroe and the surrounding counties; if nothing else, the police presence around campus seems to deter criminals.
Students can access dorms only by key or ID card, which helps keep unwanted (or wanted) visitors out. Police regularly patrol campus and are quick to respond to a cry for help. Traveling alone on campus has never been much of a problem, because there always seems to be groups of students all over campus at most hours of the day. Safety concerns will mostly involve your fellow students, and at such a large school, it's up to you to take preventative measures. If your last class isn't over until 9:30 p.m. and you're not comfortable walking home alone, call an escort. If you think you're being followed on campus, use one of the blue-light phones. IU has made many accommodations to provide for the personal well-being of all Hoosiers, and it shows.