When Ruth finds marijuana in Claire's room, she says "I read somewhere that it should be treated as a spice. Just a little pinch here and there." Writer Scott Buck says that this was advise given to him when he was a teenager.
The trivia item below may give away important plot points.
In terms of how Nate disposed of Lisa's body, a question that is raised by her sister Barb in this episode, the writers actually looked into the legality of Nate's actions. As her husband, he was legally entitled to dispose of Lisa's remains in whatever way he saw fit. However, he did break the law in burying her in public land, and by using someone else's cremains.