Well I’ve not been to the prison as well, but I know for a person to gable they will definitely need money to gamble with, and in the prisons isn’t like were cash flow on a regular basis and their is every tendency that Gambling is prohibited within inmates and prison facilities, but I’ve watched some movies were inmates are gambling like throwing dice, and playing some common poker sports in prison and gamble with them, which is very abnormal to me so I really don’t understand why the prison security allow such things to happen in prison, well I must say corruption is everywhere, and sometimes this inmates uses this tools to make themselves busy and happy because I think they find comfort in doing such things.
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I have seen such films too, but I know that prisoners often play cards. And this has been going on since time immemorial, because cards are one of the most effective ways to have fun in a closed room in a company, and also to train your brain and attentiveness.
Only often in prisons the cards are marked by their owner. This means that it is already a dishonest game, and therefore there is no point in playing against such guys at all. It will be a deception, not fun.