According to several web sites, a bill has been introduced in the South Dakota legislature that would make a state-funded loan of up to $1 million available to anyone wishing to construct and open a horse slaughtering facility in the state. Introduced by multiple members of the South Dakota State Senate and House Agriculture Committees, S.B. 170 is scheduled for a hearing in the Senate Agriculture Committee at 10 a.m. on Tuesday morning.
Not much information is available as to whether this is a meat-processing project or not.
You can check with the South Dakota state government's web site, here, which has a page on the bill.