When you go in to get blood drawn can they see that you are using drugs if they don't look for them?

Question

Okay so I have a doctors appointment on Friday. I smoked 3 hits of weed about a week ago. They are going to draw blood to test my glucose level to make sure I am not diabetic. Do you think they will look for drugs? If they aren't looking or testing for it will they be able to tell?

Answer 1

NO.  They won't be able to discover it unless they run the test and legally then cannot without your permission.  

Answer 2

they will not and can not legally test for drugs unless requested.....