Wienhoff Drug Testing

A nationally trusted drug testing program administrator.

Nationally recognized

Industry Leader


Wienhoff Drug Testing is a national company that was founded in Boise, Idaho in 1988 and is owned by Colleen Wienhoff, a nationally recognized expert in drug testing with over 31 years in the industry. Our dedicated staff of friendly professionals is always eager to help our clients.

Of primary focus to us is DOT compliance. Our knowledge of and strict adherence to DOT standards in administering testing programs has situated us as industry leaders and experts.

With over 3000 client companies, Wienhoff Drug Testing is a highly trusted drug testing program administrator. Our clients include large and small municipalities, County, State, and Federal agencies and private companies from all industries.

We are a group company, with an additional office in Salem, Oregon, Bio-Med Testing Services, Inc.

Wienhoff Leadership


Colleen Wienhoff

Chief Executive Officer and Owner

Mike Kislia

Chief Operations Officer