Drug use may have been a factor in two fatal accidents this week on U.S. 395 south of Reno, authorities said.
Jason Hanson, 25, of Reno died Monday afternoon when his Saturn crossed over the center line into the path of a van in Pleasant Valley.
The Nevada Highway Patrol said a witness told investigators Hanson may have been under the influence of methamphetamine.
Trooper Chuck Allen said investigators also found two grams of methamphetamine in a car involved in a separate pre-dawn crash Tuesday.
Samuel Cole, 40, of Sparks, was driving north when his Saturn struck a guard rail and veered into oncoming traffic, hitting a Chevrolet Blazer.
Two passenger's in Cole's car were killed. One was identified as Shawn Stewart, 26, of Carson City. The identity of a woman passenger has not yet been released.
Results of toxicology tests taken after both accidents are pending, authorities said.
Allen also said the NHP plans to increase traffic enforcement in the Pleasant Valley area, targeting reckless, aggressive and erratic drivers.