Jenn is right. You should read the book "I Love A Cop: What Police Families Need to Know" by Ellen Kirschman, Ph.D. Below is a description of the book.
Will police work change the person you love? Are police marriages destined to fail? What are the chances of your loved one being killed in the line of duty? Separating fact from myth, Dr. Ellen Kirschman answers these and other critical questions in the first comprehensive self-help book created specifically for today's police families. In information-filled chapters, readers will go behind the scenes with other police families as they discuss the benefits and pitfalls of police work; learn how to manage the effects of organizational stress and the pressures of unpredictable schedules, long hours and loneliness; gain awareness of the emotional, physical, and behavioral warning signs which can lead to such extreme situations as posttraumatic stress, alcoholism, suicide and domestic violence; find out where families can go for help and counseling; and get an inside look at cop couples and the special challenges facing women, minorities, and gays and lesbians on the force.
It is a good book!
I really want to be a police officer, but I also want to have children someday. 
