♪ shake it off, i shake it off >> reporter: mueller is suing swift for $3 million in damages. karen steinhouser is a law professor at the university of denver. taylor swift is counter-suing for $1. how do you think that is going to sway the jury? >> this case is about credibility. who do the jurors believe? do they believe someone who isn't trying to get financial gain or do they believe the elrson who is trying to get money from a celebrity? >> reporter: so, after the deleged incident, swift's security team confronted the o j., who said, "hey, call the police, i didn't do anything." but swift's mother testified, they didn't call the police because they didn't want the publicity-- which they are now getting plenty of, from all over the world. anthony. >> mason: they sure are. david begnaud at the courthouse in denver, thanks. coming up, why could there soon ittl big market for this little piggy? little piggy? that's why there's trintellix, a prescription medication for depression.