Question: I've been unemployed and job searching the past few weeks. I have a medical marijuana card which I stupidly utilized during this break. Now that I have hit my final interview, I'm a little concerned. I've quit for a while but know it's still in my system.

I know excuses don't matter in the workplace, and a failed UA means you're not getting hired. My question: So I'm flying out of state for this last interview and they mentioned they'll take care of the hr stuff there. Is it possible to have an onsite drug test or will they most likely order one for me in my home state when I return?

Answer: 
In contrast to another answer, I wouldn't count on it, at least not while you're there. They're going to fly you out to an interview and then say "oh hey go over here for this drug test before your flight back"? 

I've actually had this exact situation come up... 3 out of the 4 jobs I took were in a different area than I was living at the time (2 out of state, 1 in a city 2 hours away). The drug test will probably come after you get an offer, and you can take it in your city. In my most recent case, the company they contracted with didn't have an office in my city, so they had me go to another company that they picked. This company sent the samples to their original company for the actual work.
It's really up to the employer how they choose to do this. But you can bet that the chances are they will test you in a contracted lab in their area. Are you sure you won't pass? Heavy marijuana use will linger for a while up to 30 days if used very very regularly. If you used it a few times a week, and don't use it currently you might be fine. I suggest testing yourself to see if you pass. You can order a home test at [Drug Tests in Bulk](http://drugtestsinbulk.com/)