General information about drug testing in the United States
Drug tests in the United States can be divided into two general groups, federal mandated and general workplace.
Diagnostic screening
In the case of life-threatening symptoms, unconsciousness, or bizarre behavior in an emergency situation, screening for common drugs and toxins may help find the cause, called a toxicology test or tox screen to denote the broader area of possible substances than...What are the detection periods?
The following chart from LabCorp gives approximate detection periods for each substance by test type.