There is no drug test. They only want you to sign a form saying that you have been substance abuse free for at least two years.
No drug test that I know of
Prior to the start date
Answered - Manager (Current Employee) - Newberg, OR
Never had one
Answered - Addiction Specialist (Former Employee) - Minneapolis, MN
Before they are hired.
Answered - Chemical Dependency Technician (Former Employee) - Rancho Mirage, CA