First off, drug testing questions are not allowed here. Its a pretty simple rule.
Not trying to be a dick here, but not only should the OP not be asking this question, but the people who have been responding with answers, shouldn't be doing so. By answering drug testing questions you just encourage people to continue to post these threads.
Lastly to the OP-try not to use slang like "blues". While this term might be common where you live, most of the community will have no clue what you are talking about.-DG