Correction: not a blog. The article I linked is the Newsweek article also linked by Jim Dixon.

The Defense of Wildlife article that Jim linked states that all the existing wild colonies are "re-introduced." The Kansas colony has no known human intervention. It was discovered a couple of years ago, and was not deliberately stocked, although there could have been an accidental release there. There's some hope that the colony is a surviving original stock, but published information doesn't indicate that anyone's getting close enough to pull DNA samples to check it out - yet.

John