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Roy...an important point ! I have encountered drug addicts in the course of my work on a very few occasions but whenever I find needles lying around on the floor or the sofa, I leave asap. I am not a health professional, so I can leave without any problem, although I feel sorry for the people who have no choice but to work with this people. Our instructions from our employers is to "withdraw" in these circumstance, as our personal safety is paramount. I was attacked 2 years ago by someone who was very drunk , and I now err on the side of caution.
But I can choose my friends, and I would not associate with any that do take drugs. One couple did try to light up a spliff in my caravan some years ago, but were ejected in record time...that was my choice. They no longer remain in my circle of friends...again, my choice.