The very first question that any judge will ask is how can Lara prove that she was infected by James. Look, the fact of the matter is that there is no way they(all the involved) can prove that one or the other infected them..what's the proof Lara didn't whore herself out for $1000 for bareback sex with someone? What's the proof that James didn't fuck someone in a party bareback?
Besides, just because she tested positive on the 3rd or whatever after having worked with james 2 days ago doesn't prove that James infected her...in fact, the HIV virus takes anything between a month to 6 months to show up in which time she/he could have had sex with anyone and gotten infected then or infected others. There is also the little matter of laws. I don't know too much about it, but if there is no law which states that stars must produce test certificates(kinda like if they do it out of mutual respect for each other and fear of HIV rather than because they are bound by a law), then the lawsuit vanishes right there.
All I can say is that I feel sorry for the entire lot of them..it must be horrible to live with HIV.