Does this test for the drug gbl (gamma-butyrolactone)?

We screen for Ketamine and GHB, while it may screen and detect GBL and other drugs we do not advertise or guarantee it

Does this work on contact or do you have to wait for it to dry to get results?

wait for a few moments for it to settle and dry.

The a circle tests for ghb and the b for ketamine?

It is my understanding that you use the two circles that test for various chemicals. A positive on either is an indication of a drug, though I honestly don't know if they are specific to that degree.

Does this *only* test for ghb and ketamine?

Hello, I haven't tried the product yet. I purchased for my daughter but haven't had a need to use it. Saving it for when she goes to college.

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