PIERRE, S.D. (AP) — A Lake Andes man accused of driving drunk and killing two federal wildlife researchers is appealing to South Dakota's Supreme Court.

Thirty-one-year-old Ronald Fischer Jr. is serving 30 years in prison on convictions for vehicular homicide and related charges in the July 2013 deaths of 25-year-old Maegan Spindler, of Cazenovia, New York, and 46-year-old Robert Klumb, of Pierre.

Authorities say Fischer was driving under the influence, ran a stop sign and struck the two U.S. Fish and Wildlife Service researchers in a parking lot. They were conducting tests on the Missouri River.

The Daily Republic reports Fischer says authorities infringed on his constitutional rights by drawing blood without a warrant. The blood samples were used as evidence.

Prosecutors maintain law officers did nothing wrong.

Justices will rule later.

Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

More From KXRB