"Regarding a district courts evidentiary rulings, including rulings on the admissibility of expert testimony, we review for abuse of discretion." Reese v. Stanton, 2015 MT 293, ¶ 17, 381 Mont. 241, 358 P.3d 208 (citing Beehler v. Eastern Radiological Associates, P.C., 2012 MT 260, ¶ 17, 367 Mont. 21, 289 P.3d 131).