Keep in mind that each clinical site has their own standards regarding students with criminal history, and depending on your offense(s), you may be turned away from performing clinicals at a certain site.
If you have any concerns about whether your criminal record may cause a problem with clinical placement, you should talk to someone in your nursing program ASAP so they can work with you.
I dont know anything about that clinical wise...but Ill tell you this, because I just got hired, when you start looking for a job and get hired...they will run a background check and believe me they will possibly see things you dont want them to...and you might either be questioned about it or automatically be denied the job.. But I wish you the best. Just try to talk to some one regarding that when you apply for boards too...... IT IS going to be a big deal :/// Good luck!!!