For both Urine & Saliva Screening
All drug screens have built in procedural Control lines (C) for quality control and this verifies that the test is working " as it should."
The Control (C) line should appear first in ALL test windows - this indicates that the screen has sufficient volume of the sample specimen to operate.
If the Control (C) line does not appear in a test window - then the test should be deemed invalid and another test used.
A second line (T) should then appear in all test windows. This indicates a NEGATIVE test result (two lines in each window)
Intensity (darkness) of the second line (T) is NOT important. If you can see a second line, no matter how feint, it is considered a negative result.
These guidelines should be followed :