Drug Test:::Yay or Nay

Do you honestly believe that if a person passes or fails a drug test will determine if they are a good fit for the job?

Me personally I believe every case is different. For one it depends on the drug that they are on. It also depends on their attitude, if they got far enough to take the drug test then I believe it doesn't matter if they light up a blunt every now and then.

But anyway let me know what you think of the matter.