DOT-COMPLIANT · ON-SITE EMPLOYER DRUG TESTING
Mobile Drug & Alcohol Testing in Modesto, California
On-site DOT-compliant collections at E&J Gallo Winery — the world's largest winery with a large private CDL fleet — Del Monte and Foster Farms food processing operations, and San Joaquin Valley agricultural logistics employers.
On-site DOT-compliant collections at E&J Gallo Winery — the world's largest winery with a large private CDL fleet — Del Monte and Foster Farms food processing operations, and San Joaquin Valley agricultural logistics employers. Modesto anchors food & beverage processing (fmcsa), agricultural logistics (fmcsa), warehousing & distribution employer demand — including E&J Gallo Winery; Del Monte Foods Modesto; Foster Farms Livingston; Stanislaus Food Products, and related operators across California. For safety-sensitive CDL drivers, pipeline workers, railroad crews, and aviation employees who cannot leave a shift for a clinic visit, mobile collection keeps operations staffed while meeting federal custody requirements.
OnSite Employer Testing coordinates mobile drug testing collections at your Modesto-area facility, yard, terminal, or job site. We do not operate a clinic. Review how it works or browse all locations we serve across the region.
Why Modesto Employers Need Mobile Testing
E&J Gallo Winery CDL fleet on-site testing at Modesto distribution facilities — private fleet random and pre-employment
Del Monte and Foster Farms food processing CDL carrier testing during seasonal production surges
program design and compliance obligations remain your responsibility under applicable law — we coordinate the collections
Industries We Serve in Modesto
E&J Gallo Winery
E&J Gallo Winery — world's largest winery, large private CDL distribution fleet FMCSA (FMCSA-regulated or employer-directed programs where applicable). We coordinate on-site collections for pre-employment, random, post-accident, and reasonable suspicion events at employer facilities throughout the Modesto market.
Del Monte Foods Modesto
Del Monte Foods Modesto — canned goods food processing CDL fleet FMCSA (FMCSA-regulated or employer-directed programs where applicable). We coordinate on-site collections for pre-employment, random, post-accident, and reasonable suspicion events at employer facilities throughout the Modesto market.
Foster Farms Livingston
Foster Farms Livingston — poultry processing CDL carrier fleet FMCSA (FMCSA-regulated or employer-directed programs where applicable). We coordinate on-site collections for pre-employment, random, post-accident, and reasonable suspicion events at employer facilities throughout the Modesto market.
Stanislaus Food Products
Stanislaus Food Products — food manufacturing CDL distribution (FMCSA-regulated or employer-directed programs where applicable). We coordinate on-site collections for pre-employment, random, post-accident, and reasonable suspicion events at employer facilities throughout the Modesto market.
BNSF / UP Modesto area
BNSF / UP Modesto area — FRA covered railroad employees (FRA-regulated or employer-directed programs where applicable). We coordinate on-site collections for pre-employment, random, post-accident, and reasonable suspicion events at employer facilities throughout the Modesto market.
Amazon MOD1
Amazon MOD1 — fulfillment CDL delivery fleet FMCSA (FMCSA-regulated or employer-directed programs where applicable). We coordinate on-site collections for pre-employment, random, post-accident, and reasonable suspicion events at employer facilities throughout the Modesto market.
Applicable Regulations
Employers in Modesto commonly coordinate testing under:
- 49 CFR Part 40 — DOT collection and laboratory procedures
- 49 CFR Part 382 — FMCSA CDL food processing and agricultural distribution fleets
- 49 CFR Part 219 — FRA covered service BNSF/UP Stanislaus County
- California Labor Code §§ 1025–1028 — employer drug-free workplace programs
- California seasonal ag worker considerations — testing scheduling around harvest and processing surges
Testing Services Available in Modesto
We coordinate the following collections for Modesto-area employers:
DOT drug testing collections (FMCSA, FRA, FAA, FTA, PHMSA)
- Pre-employment drug and alcohol testing
- Reasonable suspicion and return-to-duty testing
Breath alcohol testing (BAT certified)
- Oral fluid drug testing
Mobile and on-site collections at your facility, yard, or job site
On-Site Collections in Modesto
Stanislaus County ag logistics employer testing — almond, walnut, peach, and tomato processing CDL fleets
BNSF/UP FRA covered-service collections in the Modesto-Turlock corridor
24/7 post-accident response for food processing and agricultural CDL incidents in Stanislaus County
Use our instant quote calculator to scope your collection or visit our service areas page for broader coverage context.
Questions from employers in this region
E&J Gallo has multiple facilities in Modesto — can you manage testing across all of them?
Yes. We coordinate multi-facility random pool management and on-site collections across all Gallo Winery locations in the Modesto/Stanislaus County area, including distribution centers and production facilities.
Food processing is seasonal — how do you handle large pre-employment CDL surges at Del Monte or Foster Farms?
We mobilize on-site at your Modesto food processing facility to handle large batch pre-employment CDL collections during seasonal hiring surges — processing drivers efficiently before they're cleared to operate vehicles.
Core programs: Mobile & on-site drug testing, DOT drug testing, Non-DOT drug testing, Post-accident testing, Reasonable suspicion testing, Random testing programs, Breath alcohol testing. Planning: how it works, instant quote calculator, all locations. Industries: employer industries we support. Long-form answers: Employer drug testing FAQ. Quick questions: Contact us.
For how we think about regions and feasibility, see service areas.
Nationally coordinated collection support
OnSite Employer Testing is headquartered in Illinois and coordinates mobile and on-site employer testing across selected regions and employer locations—including through partner collectors when your program, timing, and geography allow. Availability depends on location, timing, test type, site access, collector availability, and scheduling needs.
Scope collections for your Modesto-area operation
Share your facility address, expected donor count, test reason, and DOT or non-DOT status — we confirm what is workable and send a written proposal.