Ok, back from the store. The At Home Drug Test came back conclusively negative. I feel pretty good about this. And can't imagine the UA they give me at the hospital will be examined more stringently (am I naive for thinking this?)

Box says
"99.9% accuracy (as reliable as tests used by doctors and hospitals)"
"FDA Cleared"

I'm fairly certain I'm in the clear, but you'd just hate to lose a good job over something as silly as a trace amount of herb in your system, until you start working there will always be a slight bit of anxiety.