because it is called a CHARCOAL cavity test.

green

In some laboratory test/experiments, impurities and barium can be removed from a material through use of activated charcoal.

No, scientifically charcoal will not "get rid of THC" which is actually very hard to do. Charcoal cannot flush or mask marijuana in a urine test.

Most schemes to pass a marijuana test will either dilute the urine or mask it with chemicals so the sample passes a quick stick test. This does not do much good if they send the sample to a lab for further processing.

by doing chemical activities