I don't suggest just monitoring these inmates where gambling is involved, I recommend making gambling being prohibited entirely in prison. The authorities in charge of the prisons should ensure that activities capable of influencing the inmates negatively should not be encouraged in the prison yards. We want people who would leave prison with a renewed positive attitude and mindset; people who would have stories to tell those in the outside world so they would learn from these stories and guard their steps, not those who would form some bad habits from prison and come out to influence others
This thing about it being banned, you can very well understand that it's bullshit, as if banning alcohol or smoking in the United States during the Prohibition era had worked, what works is educating people, not banning them from things.
to make people understand how much you have to use things to avoid getting trapped