On a recent episode of "Intervention,  A&E's documentary series about addiction, no one was stopping Pam, an alcoholic, from driving. As she made her way to the front door ” stopping first at the refrigerator to take a swig of vodka for the road "viewers could hear a producer for the show speak up." "You have had a lot to drink,  the voice from off camera said. "Do you want one of us to drive? Pam was indignant. "No, I can drive. I can drive,  she mumbled. She then got into her car, managed a three-point turn out of the parking lot and drove off. The camera crew followed, filming her as she tried to keep her turquoise Pontiac Sunfire between the lines. Perhaps more than any other program on television now, "Intervention  highlights the sticky situations that reality-show producers can find themselves in as they document unpredictable and unstable subjects or situations. In recent years, producers and networks have increasingly pushed the boundaries of television voyeurism in search of another ratings hit. At times, this has proved problematic for television networks. There have been several lawsuits related to shows like "Big Brother  and more recently, CBS found itself facing accusations that it had created dangerous working conditions for children in its reality program "Kid Nation,  in which children aged 8 to 15 toiled in the New Mexico desert to build a working society on their own. In the case of reality-TV documentary shows like "Intervention  and the various incarnations of "The Real World  and "Road Rules  on MTV, producers can be witnesses to crimes, raising the question of when they are obligated to step out from behind the camera and intervene. Sometimes the crimes they film are relatively minor, like underage drinking or fisticuffs. But in other cases, like on "Intervention  and VH1's "Breaking Bonaduce,  in which the star, the former child actor Danny Bonaduce, got behind the wheel after he had been drinking and bragged how a car crash would make great television, the program's subjects can put themselves and innocent bystanders at great risk. And legally, producers are treated like witnesses