Wyoming Highway Patrol Interdiction — I-25, I-80 + 12 K-9 Units

Last verified: May 2026

The Major Interdiction Corridors

I-25 — Colorado Line to Cheyenne

I-25 runs from the Colorado-Wyoming state line at the Colorado-Wyoming Welcome Center north through Cheyenne, Chugwater, Wheatland, Casper, Buffalo, and on to Sheridan and Montana. The 8-mile stretch from the state line to the Cheyenne city limits is the most heavily-patrolled cannabis-interdiction segment in Wyoming, reflecting the dominance of Colorado as the cross-border source state. See Colorado page.

I-80 — East-West Across Southern WY

I-80 runs east-west across the entire southern half of Wyoming from Pine Bluffs (Nebraska line) through Cheyenne, Laramie, Rawlins, Rock Springs, Green River, Evanston, and into Utah at Wyoming’s southwestern corner. I-80 is a national east-west cannabis-trafficking corridor, with through-traffic from California, Oregon, and Washington (legal-rec source states) destined for east-coast or central-U.S. distribution markets. WHP stops on I-80 produce some of the largest single-stop seizures in Wyoming.

I-90 — Northern WY to Montana / SD

I-90 enters Wyoming from South Dakota (Black Hills region), runs through Sundance, Gillette, Buffalo, and Sheridan, then exits into Montana toward Billings. I-90 carries Montana cross-border traffic and Powder River Basin energy-industry traffic. See Montana page.

WHP K-9 Program

The Wyoming Highway Patrol K-9 program operates 12 active units. Per public WHP statements, 10 of the 12 are narcotic-detection certified; since 2019, all narcotic-detection K-9s have been trained to alert to fentanyl. Two units are explosives-detection. K-9s are deployed for both proactive interdiction (stationed along I-25, I-80, I-90) and reactive support (called to traffic stops where narcotics are suspected).

Documented Stop Patterns

WHP cannabis-interdiction stops follow several recurring patterns documented in court records and motions to suppress:

• Out-of-state plates from adult-use states (CO, MT, CA, OR, WA, NV, IL, MA, NY, etc.) stopped at higher rates than WY-plate vehicles.
• Pretextual stops — minor traffic infractions (lane-touching, following too closely, equipment violations, window tint, license-plate-frame obstruction) used as basis for stop, with cannabis-interdiction inquiry developed during the encounter.
• K-9 deployment pre-stop or during stop — Rodriguez v. United States, 575 U.S. 348 (2015) holds that prolonging a stop to deploy a K-9 without independent reasonable suspicion violates the Fourth Amendment. Wyoming defense bar regularly litigates Rodriguez issues.
• Cannabis odor as probable cause — WHP officers routinely cite odor of marijuana as the probable cause for vehicle search. Defense bar litigates whether legal hemp is olfactorily distinguishable from illegal marijuana.

The 2016 Laramie County Weekend Deployment

The largest publicly-reported single WHP cannabis-interdiction operation: a 2016 Laramie County weekend deployment yielded:

• 313 lbs of marijuana seized.
• 25 felony charges filed.
• 26 misdemeanor charges filed.
• 400 traffic stops conducted over the weekend.

The deployment scale demonstrates the WHP’s capacity for concentrated cannabis-interdiction operations along the I-25 corridor. Similar concentrated deployments recur around 4/20, holiday weekends, and Cheyenne Frontier Days (July).

Civil Asset Forfeiture — § 35-7-1049

Wyoming authorizes civil asset forfeiture under Wyo. Stat. § 35-7-1049. Vehicles, cash, and real property seized in connection with a controlled-substance violation are subject to forfeiture proceedings. Post-2016 reforms (HB 14, signed by then-Gov. Matt Mead) require a 30-day probable-cause hearing before assets can be permanently forfeited — a partial procedural protection but not innocent-owner protection comparable to states with full conviction-required forfeiture. Highway interdictions are a principal source of civil-asset-forfeiture filings.

The Felony Cliff Stack

Returning from a legal-rec state with cannabis triggers a layered exposure stack:

• Federal felony under 21 U.S.C. § 841 (interstate transport).
• Wyoming state-law felony under § 35-7-1031 if any concentrate > 0.3 g, or any plant material > 3 oz.
• Wyoming "internal possession" exposure based on metabolites alone under § 35-7-1031(c).
• Wyoming OWI exposure under § 31-5-233 impairment-only standard.
• Civil asset forfeiture of vehicle, cash, electronics, and any other property "facilitating" the offense.

Practical Driver Notes

• Decline consent searches. Refusal does not provide probable cause; "I do not consent to a search" is the lawful response.
• Record the encounter. Smartphone video is permitted in most circumstances; placement on dashboard is recommended.
• Be prepared for K-9 deployment. If a K-9 alerts, the officer typically claims independent probable cause for vehicle search.
• Get counsel immediately. Cross-border-interdiction defense requires WY-experienced criminal-defense counsel familiar with Rodriguez, asset forfeiture, and the felony-cliff sentencing schedule.
• Do not transport across state lines. Federal felony plus WY felony cliff plus OWI exposure plus civil-asset-forfeiture risk is a layered legal trap.
• Plan to consume out-of-state. Use product before re-crossing into Wyoming.

Related on this site: Send a Message, Contact CannabisWyoming.org, About CannabisWyoming.org.