I assume your talking about the business aspect, although even for private things who knows considering how screwed up some areas are when it comes to our rights. For realistic purposes that's a difficult question to answer. Even the best knowledgeable lawyers in a specific subject probably aren't intimately familiar with every single states laws, not to mention other local tendencies that you would need to know. There is just no way you could say with 100% certainty what you could do and not do, even if you have the right to. Even in some places if you should be allowed to I bet you could get drawn into a very lengthy and expensive legal fight that wouldn't be worth it for most people.