According to a news report, the slot machines are not just confined to any casino or any usual place, right now apparently in Australia there is no such law, the machines are everywhere an insight into what might be causing tbe leading probelms with increasing addiction there.
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To be honest is not the only place where such a machines are not widely allowed outside specific spaces and always with an age control system of shorts. In UK, you will not see a slots in any pub, only in betting houses, in Spain, there is a limitation of 1 machine at bars and restaurants, in many EU countries, these are as well limited. I will not go into limitations in muslim countries and the like but... it is pretty much that way in most places.