State v. Rust, 405 P.3d 869

Police surveilled Rust after tips; short-stay vehicle traffic to his home led to stops where occupants were found with methamphetamine.
Casino records showed Rust lost about $150,000; searches of his vehicle and residences uncovered owe sheets, wire‑transfer receipts, large cash sums, gambling records, stolen property, drug paraphernalia, and a hidden bank receipt tied to his wife.
A cooperating witness (the girlfriend of an associate) testified that her boyfriend regularly bought meth from Rust, sometimes after meeting Rust in person, and that money was often wired to Rust.
Experts testified that (1) gambling and transfers can be used to launder drug proceeds and (2) Rust’s tax returns omitted reported gambling wins/losses, illegal income, and some employment income.
Rust was convicted by a jury of one count of money laundering (2nd degree), one count of conspiracy to distribute methamphetamine (3rd degree), and two counts of filing false tax returns (3rd degree); he appealed.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Sufficiency of evidence for conspiracy to distribute methamphetamine	State: witness testimony plus corroborating circumstantial evidence proved Rust agreed to distribute drugs	Rust: witness was unreliable, didn’t see direct exchanges, testimony inherently improbable	Affirmed: jury could reasonably infer conspiracy from witness plus corroborating evidence
Sufficiency of evidence for money laundering	State: transfers, gambling activity, owe sheets, and drug conspiracy show Rust knew funds were drug proceeds	Rust: funds could be lawful gambling or controlled by his wife; lacked knowledge money were drug proceeds	Affirmed: proof of conspiracy and transactional evidence supports that Rust knew funds were illicit
Sufficiency of evidence for filing false tax returns (intent)	State: circumstantial evidence of concealing drug proceeds and moving money supports intent to evade taxes	Rust: believed income was lawful or offset by gambling losses; omissions were innocent	Affirmed: jury could infer intent to evade from concealment and unexplained cash flow
Admissibility of expert testimony on ultimate issue (money laundering)	State: expert explained laundering methods and opined hypotheticals mirrored laundering	Rust: expert impermissibly gave legal conclusions and may have suggested no mens rea required; plain error	No reversible error: even if testimony was improper, any error was harmless given sufficiency of other evidence and conspiracy conviction

State v. Shumway, 63 P.3d 94 (Utah 2002) (standard for reversing verdict for insufficient evidence)
State v. Robbins, 210 P.3d 288 (Utah 2009) (when testimony is inherently improbable and judge may disregard jury credibility finding)
State v. Pearson, 943 P.2d 1347 (Utah 1997) (plea agreements and witness reliability)
State v. Workman, 852 P.2d 981 (Utah 1993) (jury as sole judge of witness credibility)
State v. Holgate, 10 P.3d 346 (Utah 2000) (plain‑error test)
State v. Stringham, 957 P.2d 602 (Utah Ct. App. 1998) (limits on expert testimony that mirrors ultimate legal questions)
State v. Davis, 155 P.3d 909 (Utah Ct. App. 2007) (expert testimony giving legal conclusions should be excluded)