Take zero's advice....sounds like you'll be clean. Drinking green tea on a regular basis really does help seeing how it is an anti oxidant. Your probably clean right now but drink lots of water as a precautionary measure.

They arent testing for drugs with the blood work. The drugs will be tested in your urine.

Blood tests are for your overall health to see if you have any diseases or like your cholesterol level, thyroid, overall health issues and shit like that. Alchohol levels are tested thru blood as well. Thats what the blood test at my work was for mainly. If theres a drug test, it will be in the urine as a drug test thru blood as I'm told is very expensive. Thats what I hear.