Psychocat, that was one pretty useless link. Why did you even bother posting it? How was that supposed to help the OP's question on blood detection? Much better information can be found in this forum so it's almost insulting to try to use an inferior site to answer the question and the link didn't even have anything to do with blood testing. It mentions blood once but in reference to THC. Well if you did some research you would know that drug tests don't look for THC, they look for metabolites of THC so that link was just so useless.

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Serenity now, Insanity later...

Get a home drug test if you want to know for sure if you can pass a drug test. Drinking lots of water for days and days before the test will not help you get clean quicker. All that water will not make your kidneys work better.