Here (http://www.slate.com/articles/news_and_politics/explainer/20...) is an interesting article about this issue from 2009. It says that while some states require the availability of information like name and badge numbers, many do not. However, some police department's will still implement policies requiring it be provided if requested. This is out of date and not terribly detailed, so I'd be curious to hear from someone with more complete or up-to-date information.