Got a question, Bo; you said the wasted deer were all in the same area. Were they killed at approximately the same time of year, give or take a week? If so, you've got a pattern on your poacher. Hunt him next year (with a camera, silly, and/or a witness) and put the bastard away. See if the local DNR has a couple of trail cams to lend. Of course declaring war on a neighbor can be tricky...unless you give the credit to the DNR and make sure you don't have to testify openly, which is usually possible with DNR.