Permission Forms do they go far enough to protect you?

Most of the forms I have seen only state that the person detecting will not hold the property owner liable for a lawsuit. Well what about you? what happens "IF" the owner falls on his face mowing the lawn or someone goes to that property and gets hurt and now they say it was in one of your holes. What happens if something goes missing from their property? What happens to you? lawsuit? who knows. Remember if you need a permission slip you probably dont know anything about them and vise versa. I need to protect myself. If the fact that they wont sign this as it is written then no big deal i move on. I do not believe anyone is going to a property to rip anyone off or do any damage to anyone or anything, but I am going to cover my tail end. Have I used this, no I just got done writting it up. Use it or not, cover your tail as well as theirs this is a mutual form that you are the one who gets most of the benefits. So abide by the metal detectors code and cover your tail! :!: