I don't see why not.. They do allow mail into prisons so long as it's screened before hand

Me (and many others) recieved successes from rapper Lil' Wayne when he was in prison.

I was reading on the news today that actor Wesley Snipes has begun his 3-Year sentence in a federal prison in Pennsylvania... and it got me thinking about requesting autographs from celebs. currently serving time.

Has anyone ever done this before?
Are prisons accepting of fan-mail and autograph requests?
Do you have experience with this or know of others that have done it?