What are the TN no trespassing laws?

Most states have laws that require the owner of porperty to post their property lines with No Trespassing signs, or Keep Out, something to that effect. If someone crosses that line, (this is key), and you catch them. You give them a written warning, the first time, and advice them to stay away or not to return. It helps if you can get an officer (whatever kind is avaiable) to the site while they are still there the first time. At least report the trespass and the written warning. The second time call the Sheriff, or whatever officers first, now you have the right to press charges, if it is the same person and the officer catches them. It is very hard to get this handled, recently in my state they changed the law to make it easier because of hunters using dogs. They cross posted land all the time and claim that they are only following their dogs. Of course, they release their dogs at the road in front of your property, where do you think the dogs are going? So, the Sheriff has started pressing charges themselves, if they catch the trespasser on your property, and it is the second time. This is still very hard to get charges pressed and to get them to stick. Mainly because it is so hard to catch the person on the property and then keep them on it until the law enforcment officers arrive to witness the event. I don't know what they are in TN, but I'm betting that they are similar through out the states. If you have a specific problem, I'd clarify the laws with my local Sheriff's Dept. in my county.