When you are in designated testing positions or probation, you can be selected at anytime or randomly to test. One example is a female that I knew that smoked the weed. She had to test to get the job, she bought that over the counter **** and drank it a couple of hours before the test and passed. True story.
This is why anecdotal evidence is worthless. See the thing is that you're ignorant of the fact that your job's drug test doesn't obviously test for masking agents. That and the fact that you equate job related drug testing to WADA accredited doping tests. In doping tests, not just the drug is tested for but so too are the drug's masking agents and known effects of said drugs. Anyways...
here's from a poster that's knows the process. This content is protected I believe this guy more than you, no offense. :good I you want to read more about what he says on this topic, click the link up top.
Pac offered to give urine every day. I've heard the stuff from the 'head shops' don't work from employers who just shake their heads the number of guys showing up 'dirty' when they know when the test will be weeks in advance.
No I am not ignorant to that, however, it only clarifies what I said. There are masking agents that can get around urinalysis. In addition, many drugs can only be detected in urine for a short period of time. If they are gone after two or three days, it does not matter who does the test they are not going to find anything. I have a question for you. Is the detection time the same as blood and urine?
Question makes no sense unless we know what substance you are asking about. Some substances can be detected for longer in urine, some for longer in blood. So what substance are you asking about?