Worried? No. But this is always a risk. Comes with the territory. During graduate clinical training you learn alot about ethics as well as learning how to covering your ass legally, should you be accused of something. Guarding against frivolous lawsuits is easier than avoiding false accusations though. Many things here, but probably most importantly, know how to deal with pathology, dont get sucked in, don;t take things personally, follow the ethics code, dont give out your cell number, consult with peers, know how to write good progress notes, and document, document, document,