Can the drug test be adulterated?
The test is virtually impossible to adulterate. Make sure the donor has not eaten or had anything to drink for a minimum of 10 minutes prior testing. Q: How do I know if the drug test is negative? A: Red lines appear in the control region (C) and next to each particular drug name in the test region. The negative result indicates that the drug concentration is below the detectable level. The shade of red in the test region will vary, but it should be considered negative wherever there is even a faint pink line. Q: How do I know if the drug test is positive? A: Red lines appear in the control region (C). No line appears in the test region next to a particular drug name. This positive result indicates that the drug concentration is above the detectable level. All positive results are presumptive and should be confirmed by an alternate method (e.g. GC/MS or GC/MS/MS).
