Is there anyway that I can find out through the Department of Correctional Services who is or has been in prison?

 This part of the web page is Inmate Lookup, updated throughout the day to include transactions that occurred within the last half hour. It lists who is and has been in prison, their crime and sentence data.

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The Department of Correctional Services home page, Inmate Lookup.
URL: http://nysdocslookup.docs.state.ny.us/kinqw00