Formerly of MSNBC, “Countdown With Keith Olbermann” (7 p.m.) moves to Current TV, Monday through Friday.

What is Current TV? Or, rather, where is Current TV? According to the network, Current TV is now available in 60 million homes, on many cable providers and both Dish and Direct TV.

Keith Olbermann’s reasons for leaving MSNBC remain a tad murky, and the changes he makes to “Countdown,” if any, remain to be seen. Current is clearly hoping he will help put the network on the TV map, in much the same way “Countdown” raised awareness of MSNBC. It’s easy to forget that way back in the late 1990s, when MSNBC first began, its average audience was in the tens of thousands.

Current’s best-known show, “Vanguard” (8 p.m. today), showcases young correspondents and video documentarians offering an extended examination of a single subject. The stories are a rather welcome break from the short, sound bite-driven coverage of network news and a nice departure from cable news networks and their slavish devotion to politics as a spectator sport and, therefore, a place where campaigning never ends and governing doesn’t much matter.

Tonight’s “Vanguard” focuses on the scourge of heroin addiction in Massachusetts, an epidemic fueled by the easy access to prescription painkillers, most notably OxyContin. Apparently many young people get hooked on OxyContin and then discover that heroin provides a comparable high at a much lower price.

Correspondent Mariana van Zeller spends time with addicts and former addicts, among them a former star football player who got hooked on painkillers after a gridiron injury. She also examines the emergence of Florida as a source of cheap and readily available OxyContin and finds that prescription drugs from the Sunshine State have become a common Massachusetts street drug, like cocaine and crack.

• The documentary “Sex Crimes Unit” (8 p.m., HBO) offers a real-life look at the kind of crimes solved on “Law & Order: SVU” and examines the relatively recent emergence of this field of law. As late as the 1970s, laws dating back centuries made it impossible to bring rape charges or sexual assault cases to court. And women victims and accusers were often subject to a brutal and humiliating courtroom exposure of their private lives and sexual history.

As this film makes rather clear, the system was weighted in favor of protecting a man’s honor and operated under the assumption that most assault victims had only their behavior, or their character, to blame. “Unit” also stresses that no matter how much societal attitudes have changed, many cases now are solved only because of the emergence of DNA evidence and the widespread use of surveillance cameras in stores, in nightclubs and on the streets.

• One’s about addiction and the other is sadly habit-forming. “Intervention” (8 p.m., A&E) returns for an 11th season. “Hoarders” (9 p.m., A&E) enters its fourth season of cringe-inducing viewing.

Tonight’s other highlights

• Folks turn their pool into a shrine to Mickey Mouse on “My Yard Goes Disney” (7 p.m., HGTV).

• Questions arise on “Switched at Birth” (8 p.m., ABC Family).

• “Unsung” (9 p.m., TV One), the series dedicated to underappreciated music acts, profiles Alexander O’Neal and Cherrelle.?