Corrected entry: In the scene at Louis' plantation, Lestat grabs and kills a rat, drains its dead blood into a glass and hands it to Louis to drink. Louis drinks it and suffers none of the effects later shown in the movie that are associated with the drinking of dead blood. More importantly this also contradicts Lestat later who says in the movie 'never drink from the dead', to 'drink before the heart stops' and 'you let me drink dead blood'.
Correction: The rat died after its blood was drained, not before. That means its blood was still alive when Louis drank it.
HockeyPrincess