On-Site Testing Specialist's

On-Site Testing Specialists was established in March of 2002.

We have built our company on extensive customer service and knowledge in all areas where drug testing is applicable.


We are familiar with the needs of all facets of the drug testing industry. We maintain clients and their specific needs in the Criminal Justice Department, Employee Drug testing, Treatment Centers, Pain Management Clinics, Clinical Laboratories, Nursing Homes, Hospitals and Pharmacies.


We sell everything from Drug Tests to pregnancy tests to  collection gloves. We offer extensive customer support and training on all of our products. We service all over the United States and Canada. All urine products are FDA cleared and many of our products are CLIA waived.

Our Team

Jeffrey J. Kovalik

Owner & President


Jeffrey J. Kovalik has been a pioneer in the drug testing field for over 30 years.  Jeffrey has a Bachelor’s Degree Business Administration from Robert Morris University in Pittsburgh PA.  Jeffrey has held several key positions such as district manager for American Medical Labs, Fairfax VA.  Regional manager for Quest Labs, Pittsburgh PA.  Founder and president of 1 Step Detect Association, Jefferson Hills PA.  Owner and VP of Sales for Branan Medical Corporation, Irvine CA.  VP Sales of Chematics Inc., North Webster IN.

Steve Stewart

Vice President of Sales


Steve has worked in the drug and alcohol field 13 years. He has extensively worked in drug and Alcohol rehabilitation and the laboratory industry. He also works with the workforce in regards to drug testing and policy.

Sandy Wolf

Office Manager


Office manager and has been in the drug testing field for 16 years. 

Heather Grunseth

Administrative Assistant


Administrative assistant providing consistent client support with billing, shipping, and ordering for the past 10 years.

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