If you are here, you are probably wondering how to pass a blood drug test? A blood test is the second most common drug test used to date. A urine test is the most popular. However, blood tests are the most expensive drug tests used, and therefore – are the most reliable. Many companies will not use them due to the cost, however – if you are quite high up in your company, expect a few of these throughout your career. They are quite hard to pass as well, as you cannot use somebody else’s blood, which you may be able to do with urine. You cannot use synthetic blood either, as this is all supervised. Therefore, you have to be able to detox your body of all traces of THC, so how to pass a blood drug test?