I too, recently actually, maybe about 5 months ago had to go get blood tested for a green card. Before they take your blood, as well as before they give u a tb shot and one other thing (I forgot), they should give you a questionnaire asking you specific questions such as if you've had this disease or this, they also ask you if you've ever taken drugs. I put down no....I suggest you do the same. God do I digress. To answer your question no they don't test you for marijuana.... I too was sweating bullets, and was a nervous wreck. Relax, :rastasmoke:...maybe later on today I'll pull out the medical form and tell you specifically what they test for in your blood. Later