There are 2 types of one panel THC tests from Walgreens, the At home THC test and the First check THC test, I took the At home one panel THC test this morning using the first void of the day, it showed negative, as it should because I'm over 30 days smokeless, I have already sent it in to the lab to make sure that it passes the gc/ms test, and to verify the accuracy. The test I wanted to use was the First Check one panel THC test, but its only available online and not in stores in my area , The First Check one panel THC test has been proven to be 100 per cent accurate when testing both positive and negative gc/ms confirmed samples in the lab, so that test you can rely on without sending it in for confirmation. However if you have time before your real test send it in, it's free and then you know for sure you will pass even if its done with gc/ms.