You need to be a resident in Bolivia and have a reason for going in(know someone who is convicted).
If you go in you will probably take fleas home with you.
Source: I live in Tarija, Bolivia
The tours of the prison used to be possible in the past, but with the publication of the book ‘Marching Powder‘ they became very popular and the government finally cracked down on the whole situation in the prison.
It is no longer possible to do the tours or get into the prison (unless you are convicted to serve time there)
Credit:stackoverflow.com‘