How to Write a Believable Policeman or Reporter

"I cannot for the life of me write a believable policeman or reporter and it's become the joke of our writing group that they're just abysmally awful but I also had a mortician and a therapist in the first book the first my first pass the therapist was wildly unbelievable," he says. "So what I did is is just what you suggest I went ahead and wrote it anyway with what little information I had and just tried to make the people believable and it has turned out well  in the end morticians who read it now say that it's more or less accurate so well I'm going to go ahead and end us here."