top of page
PAS Syatems International Logo



PAS VR Passve Alcohol Screener
Alcovisr Click-It Personal Breath Tester
Nightlock Lockdown System
PAS Alcovisor Mercury DOT Approved EBT
PAS AlcovisorMARS Bluetooth Sensor


Twin Tiers Drug & Alcohol Testing, LLC is proud to announce our association with PAS Systems International.  PAS Systems is engaged in designing, manufacturing, and marketing innovative instruments focused on detection and measurement of alcohol presence in breath samples or ambient air. These instruments have broad applications in law enforcement, correctional institutions, schools, military, and the transportation industry.


PAS is the recognized leader for its expertise in the field of passive alcohol sensor technology. Their passive alcohol sensor designs are based on twenty-five years of research by independent and government traffic safety organizations.The company's P.A.S. Systems Technology provides proprietary platinum electrochemical fuel cell sensor instruments for enforcing alcohol impairment legislation across the nation, and in most countries of the world.

Best of all, Twin Tiers Drug & Alcohol Testing, LLC has partnered with PAS Systems for distribution and training of their products.  They will be the ONLY line of Evidential Breath Testing machines we train for, and sell.  We could not be more impressed with the level of design, craftsmanship, ease of use, and (best of all) affordability PAS Systems has to offer, in the field of breath alcohol detection.  

Mark V Alcovisor
PAS IV Passive Alcohol Sensor and Flashlight
PAS Alcovisor Satellite
PAS Alcoviso Jupiter DOT Appoved EBT

PAS Systems not only manufactures and produces the finest quality breath alcohol screening and confirmation devices, but they also offer protective devices for schools such as the Nightlock Lockdown System.  In the event of an active shooter or intruder situation, teachers can quickly, and easily, "lock down" the classroom with one swift motion.  This system has been tested by numerous law enforcement agencies who have all come to the same conclusion; it works!  Twin Tiers Drug & Alcohol Testing, LLC is proud to offer these, and other, great products from PAS Systems International.

Just like TTDAT, PAS Systems International is proud to be an American-owned and operated company, located in Fredericksburg, Virginia. They stand behind all of their products and strive to provide quality and service, that is second to none. Most of PAS Systems' products, presented on this website, comply with the Buy America Act, 23 U.S.C. Section 313, and the NHTSA compliance guidelines, regarding the use of highway safety grant funds to purchase products manufactured, or assembled, in the United States. For more information on PAS Systems Products, that you see on this website, please contact TTDAT at 570-888-8378.

In the coming weeks, we will have a section of our online store, dedicated to PAS Systems products.  The PAS Systems Evidential Breath Testing units will be the ONLY devices we provide training for, and promote, to our new TTDAT Certified Breath Alcohol Technician Course clients.  In the meantime, feel free to call us regarding PAS Systems' breath testing products. 570-888-8378

bottom of page