tree stands

What are the rules on tree stands?

Are they public domain meaning first come first serve? I understand the rules and this to be the case on BLM land but what are the rules in Caribou National forest? When can they be put up? How long can they stay up? This is confusing to all and leads to a lot of argument and confrontation. I have seen a TON of stands on national forest. Many are up year round almost all use screw in foot pegs. What is legal? Need your help. The fish and game regulations are too vague. Some say tree stands are not blinds and don't fall under the same rules.