Here's an article about it:
The Denver PostCastle Rock this week will wade into an issue that has vexed metro Denver for decades -- should the town lift its ban on pit bulls, a prohibition it has had in place for more than a quarter-century? The town has scheduled an open house for 6 p.m. Wednesday where residents can learn details about Castle Rock's breed-specific ban and what might replace it, along with other animal-related topics such as the potential to allow backyard chickens and bees.
https://www.denverpost.com/2018/01/28/pit-bull-bans-denver-area/