Here in Oklahoma you can go to the county sheriff website, Oklahoma district court records website or the Oklahoma Supreme court network website. It's a piece of cake & you can always select 'notify me when this inmate has been released' & they'll send you an email. As for prison I go to the Oklahoma Department of Corrections website.
There's also a website called "VINE" & you can locate people of most states.
I am not sure what state you are from...but here in new York just simply call the main precinct in your area and ask them.all you need is the inmates name.or if it had been more than 24 hours you can go online and google your local jail and enter the inmates info.org just simply call the jail.