No they do not do a blood test. I was in the Marines for 5 years and I'm pretty familiar with the tests. It is a standard piss test, but you have to be very careful to pass. #1. Check out www.whizzinator.com, as the tests are monitored
by a designated "dickwatcher". this thing has a prosthetic penis and uses synthetic urine. Pretty expensive but well worth it when you consider the alternative outcomes. #2 don't fool around with detox cleansing formulas and drinks. They NEVER work for these tests as the levels of detection are set to show positive results for microscopic amounts of THC or anything else for that matter. #3 you may or may not have to take a test at the initial military processing place (MEPS) but you will definately be tested within a couple of hours of arriving at boot camp. Unfortunately those that pop positive won't be found out for about 3 weeks, as the military is slow to process the tests and this may mean you'd be in boot camp sweating your ass off and then all of a sudden 3-4 weeks later get summarily kicked out for failing a drug test....... and nobody wants that. good luck, you picked a bad time to join the military though. Screw George Bush and all his right wing cronies.