If the person is in the California prison system you can go to cdcr.ca.gov and look up the prison the person is in and locate his or her CDC number and then call this number (916) 445-6713 and inquire about the projected release date that number will also be able to give you their CDC number if you are unaware, but you will need to at least know their birthdate and last name I believe. This has proven the only method I have been able to find helpful in my search for the same answer. Unfortunately California does not have an inmate Locater search engine any more, not sure why but the stop ed it. If you need to inquire about another State I would suggest looking up that direct State or if you know the prison the person is in then go directly to there site. Hopefully this information was plenty helpful, if not I do apologize.