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welcome to this product demonstration video where were just going to talk a little about interpretation of drug testing results and the difference between a positive and a negative drug test result what weve got in front of you here showing these two sample cassettes one of which shows a positive result when one of which shows a negative and were just going to try and focus in now on the results windows there we go now what you will see here is that both of the tests show control lines now it is important that every test membrane shows a clear control line to demonstrate that sufficient urines been added to the test to run the complete tests efficiently and a control must always show if no control shows the test is invalid and however must be repeated or replaced now the results interpretation is given by the presence or absence of the test line indicated on this test cassette by the T youll see that the test cassette on the right shows a faint T line in comparison to the control l