Substantial evidence is relevant evidence which a reasonable person could accept as adequate to support a conclusion. Nicholson v. United Pac. Ins. Co., 219 Mont. 32, 42, 710 P.2d 1342, 1348-49 (1985). Substantial evidence must be more than a mere scintilla, but may be less than a preponderance of the evidence. Carestia v. Robey, 2013 MT 335, ¶ 7, 372 Mont. 438, 313 P.3d 169. Although it may be based on weak and conflicting evidence, to rise to the level of substantial evidence, it must be greater than trifling or frivolous. Baird v. Norwest Bank, 255 Mont. 317, 323, 843 P.2d 327, 331 (1992).