Good to note.
On another note... about being a contractor with drug testing... I do know that when I worked for a company in Orlando, we built custom fixtures for different businesses and in order to get our installers onto certain amusement park grounds, the park wanted drug testing done on all of our independent contractors (installers) for liability purposes. So just being a contractor does not mean that in order to get a certain job, you won't be held to certain specifications. (They were not testing for nicotine, but for illegal drug use.)
The reason I asked is because I was told at a job interview that I'd not be hired because I was a smoker, and smokers took too many breaks. I said fine, dropped my card on the desk and said "If you have any overflow, I have my own studio" and walked out after exchanging nice words with the interviewer. I had a job as a bartender so I wasn't terribly heartbroken or going to starve to death.
They did call me on a regular basis, and I did lots of artwork for them, but from my studio and at a ridiculously inflated rate. They did try to hire me later that year, but the whole not giving me a job the first time around hit my feisty button.