this is what i found on 420colleges site.....
http://sites.google.com/site/420college/faq
Q: I have a criminal record, will I still be able to open a medical marijuana business?
A: Yes, you can. Your criminal history does not affect your eligibility to get a doctor's recommendation and become a medical marijuana patient, thus, you may cultivate and distribute medicine to the patients in your collective. But if the terms of your probation or parole do not permit you to posses anything that is FEDERALLY illegal...you cannot do business. You need to go and see the judge who issued your probation or parole and speak with them in regards to it