I am currently applying to JAG.

I was previously in the Army National Guard.  In my paperwork to the NG I said I did not use marijuana because I did not.  However, after Basic Training, when I was in college, I tried it once (if you would even call what I did trying it).  Now, on my application to JAG I will need to put that I did try it.  Will this use, after enlisting in the NG, hurt my chances of becoming a JAG officer anymore than if the use had been prior to enlisting in the NG.

What about polygraphs for JAG officers...