Whores, Hoglegs, and Whiskey
Denver is a wild and reckless place full of wealth and poverty all intermingling with each other on a consistent basis. There are multiple seedy characters both rich and poor, and a thriving gang scene. Vice is endemic. Laws against prostitution are only enforced on the rare occasions when it is necessary to harass the local Chinese community. The same could be said for any laws related to liquor or the consumption of opium. The police force is underpaid and understaffed, leaving them quite vulnerable to bribery
Silver mining originally drew people to the city but now it is considered the gateway to the far west, and the area around Denver is noted as being fairly rich in ghost rock as well as silver and copper.