In Missouri, the dept of conservation has made it very clear that if you see feral hogs to kill them on site. No tags or license required. I live in north-central MO and have never ran into one,, but for it to be in our D of C magazine they have to be making their way from the south. I'm guessing southern MO has them in limited quantities.
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!