Texas has a different outlook on private property than most of the rest of the US. Private property is just that, private. You can do most anything you want with it. Heck, if you own more than 10 acres, you don't need building permits, no zoning laws apply, and you can even install an outhouse if you want. If the property owners wanted to, they could dig up the bodies.
Besides, you will not hardly find anything actually on a grave. Most people have great reservations about walking over a grave, but will stand or kneel beside the grave.
These were found on the pathways between the graves, and in the area that was used for funerals.
The newest grave here is from the early 80's. I am not after anything that belonged to the "residents", just their visitors.
I DO respect the trepidations some of you have voiced here, but I consider this to be more like archeology than grave robbing.
BTW: My rules of hunting other's property are that Items of historical value are always offered to the landowner first.
I am mostly after the hunt, and maybe enough clad for a set of batteries.