well thank you all for your advice,some good some rubbish.
i am the mother who for the good of her son would go on this forum and ask for advice.
he has now returned and i have a few answers.
he took the drugs last year(hence the date on the bottle was out of date)so my concerns about his recent behaviour were un founded and i now can put it down to teenager moods.
he was not injecting(i am sure why this bothered me so much but it did)he was taking it orally.
he did do P C T,and detox his liver.the man he got them from would not sell them to him till he talked him through all the pros and cons.
he is fully aware of all the possible side effects.
he was only planning to do it once a year,but we are going to do some research together(hopefully this way i can talk him out of it)
i hope the people here who have been abusive never find them selves in my situation,as a parent.
i only want the best for my son and this involves trying to understand him,and trying to steer him in the correct direction.
he is in the eyes of the law almost an adult,and by taking the wrong stance he could legally left home and got himself in alot of trouble.
thankyou