most THC drug tests also specifically search for certain 'masking' ingredients ... specifically, bleach is looked for, as is niacin, and others (this shit is YEARS old) ... any trace of a 'masking' agent will disqualify the test, resulting in a supervised re-test, usually a more expensive, more discriminatory test, that IS impossible to beat ... these tests are constantly evolving to catch the new 'tricks' ... they read those silly ads in the pages of HIGH TIMES, too ... ... bottom line: if you frequently smoke pot, you will flunk your drug test. period. ... and as quickly as you hear about some new method to beat it, 'THEY' will be waiting for you with their new tests ... :smokin: