Nadell

Among other issues, we must decide whether the trial judge fulfilled his Dau-bert gatekeeping role in excluding certain expert testimony.

I — I

On July 22, 1994, Brenda Nadell drove her sister and young daughter to Michael Laing’s residence in Las Vegas, Nevada, so that her sister could interview for a job. At Laing’s invitation, Nadell consumed several alcoholic drinks, enough to render her unable to drive. She went into the guest bedroom to lie down, whereafter an altercation between Laing and his ex-wife brought Las Vegas police officers Gregory Zeil and Michael Etherton to the house. Laing invited them in.

In the living room, the officers found broken glass and Nadell’s sister and daughter spattered with blood. Etherton asked Nadell’s sister to remain in the front room, but she instead took Nadell’s daughter into the guest bedroom. Etherton followed her. Shortly thereafter, police officer Steven Leyba arrived on the scene and joined Etherton in the bedroom. Nadell began screaming at the officers. She then *927 allegedly attacked Leyba, who, aided by Etherton, restrained her by pushing her up against a wall and wrestling her to the ground. Leyba then arrested Nadell for…