In my story a witness is being protected in witness protective custody by a cop. But for the twists and turns I want it to take, I want the cop to be on his own, with no partner, or team to back him up. Is it believable that the police would only assign one guy per shift though? I have thought about other ways around it, and asked other opinions, but it seems that the story will only work if it's one cop only. Basically the cop has to see some things that no one else can confirm happened, so if I make it just one person who says he something he cannot prove, it makes easier compared to three cops for example, all saying they saw the same thing. Since I am writing a screenplay, I tend to use a lot of movies for example. One movie I can think of that is about a cop, or U.S. marshal in this case, protecting a witness is Eraser (1996). In that movie Arnold Schwarzenegger plays a U.S. Marshall. He stashes the witness under his protection at a safe house, gives her a pistol and tells her to use it if she has to. He then leaves her there, and says he will see her again at the trial! So even in that movie they were able to get away with no cops being at the safe house for later when she had to go on the run. However, can mine be believable with just one, or is their any way I should write it so that it is?