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I have run a SureStep™ Drug Screen Test and there is no line in the Control region after 10 minutes, how do I interpret this result?

CONTROL drug line Minutes region run screen surestep™ Test
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I have run a SureStep™ Drug Screen Test and there is no line in the Control region after 10 minutes, how do I interpret this result?

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The result of this test is invalid, the presence of a line in the control region indicates that the test has worked correctly.

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