Now if you know that somebody is a drug addict and they've just had an injection you keep away from them, erm if they're having a bad trip, whatever they call it, because you don't, they become very violent, they can do a lot of damage, now the only time you will step in and help is when they go unconscious, but at the same time remember protect yourself, we're talking about needles here and probably shared needles, you must be terribly careful that you do not get pricked by a needle, especially if, they have a habit of sticking needles under lapels, so always be aware of this, if a person is a drug addict, in fact if you can find some easier way of turning them into the recovery position, do so, erm, you can then obviously either call the ambulance.