Drug addiction is a tenacious disease and so, a stint in rehab often isn't enough. Rehab might give an addict the tools to stay clean, but once out and on their own, it's tough to stay the course.

That's where a good support system comes into play and for those who go back to bad habits, a crucial part of that team is a sober coach; they're the focus of "Relapse" (A&E, 9 tonight), a powerful show from the makers of "Intervention."

"Intervention" has made an impact by showing the horrors of addiction, the toll it takes on the user and the user's family. "Relapse" continues that raw quality but gives a glimpse into the work of those who fearlessly give one-on-one help to the addicted.

NCAA Tournament Championship (9pm, CBS) - The National Champion will be crowned tonight.

Relapse (9pm, A&E) - Yet another A&E reality show about people battling addictions. In this one, sober coaches help prevent high-risk addicts from relapsing. See our review here.

Being Human (US) (9pm, Syfy) - Sally copes with the aftermath of her exorcism.

American Pickers (9pm, History) - A California salvage yard that's been in the family for generations is discovered. In the spotlight tonight, a brass diving helmeet and a rare car hood ornament.

Nurse Jackie (10pm, Showtime) - Dr. O'Hara's anger at Jackie drives her to look for a new job, and Akalitus launches a campaign to bring first lady Michelle Obama to the hospital.

Harry's Law (10pm, NBC) - In the first season finale, Harry (Katy Bates) defends Josh Peyton when he's charged with assault after suffering a mental breakdown. Also, Adam and Rachel defend a death-row inmate, but the case is jeopardized by a clerical error. It's likely this show will get picked up for a second season.

Castle (10pm, ABC) - Castle and Beckett investigate the death of a reporter found in a pizzeria's oven. His murder may be connected to an expose he wrote called "The Pizza Wars."

All About Aubrey (10pm, Oxygen) - Russell Simmons offers a frustrated Aubrey advice about her love life.