I guess it depends on what kind of tests you have to go through. Those over-the- counter tests you can buy at Walgreen??s or the like are easily fooled by such techniques. Unfortunately if you are going to work for the FBI or the Department of Defense they use a much more sophisticated series of tests; including a spectroscopic analysis. Those tests, which cost between two and three hundred dollars a sample, will detect nano grams (0.000001) of THC residue and the subsequent by products and there is no way to fool them except substitution. Most prisons, school districts and minimum wage employers do not have the budget to use tests of that accuracy, and their greatest concerns are with opiates and stimulants anyway. When my son was in the rehab center the local FBI lab performed the tests as a ??public service?.
While most tests will NOT pick up second hand smoke a spectroscopic analysis will. If you are going for a ten dollar an hour job they use a cheap test. However if you have a multi million dollar contract to overhaul wing making machines for the Skunk Works they get a little more intense.
As a side note on a normal day I drink between a gallon and 6 quarts of water and even with that kind of liquid intake a cheap test will pick up the massive amount of THC trapped in my system. There are not a lot of people out there who can smoke up to a dozen joints of 15% THC Blueberry every day. Another consideration is THC??s affinity to fat compounds. I know of a fellow who tested hot even though he had stopped smoking months before. He had started a diet and was loosing about 3 pounds a week and as the fat burned the THC stored there appeared in his urine. Another fellow insisted he ate biscuits and gravy for three days before a test and he claimed it trapped all the THC in his system and he could test clean. I have no documentation to support that statement, but the dieter was a good friend and he fought the firing and won.
There are a number of web sites devoted to evading drug tests and there is lots of documented evidence as to what works and what does not. I prefer to work for companies that respect their employees?? privacy and do not test at all. Or I run my own business. There are web sites that review which companies test and which don??t and I try to do all my business with companies that are test free. Why support the test Nazis?
Thanks for Listening
Doctor G