DRUG USE. QUESTIONS. THANKS!?

Question by Katie: DRUG USE. QUESTIONS. THANKS!?
Need advice bad. about drug use. best answer ten pts.?
what does it mean when someone substitutes? (in the drug world)
my friend got caught by his parents with marijuana and oxycodone.
He didn’t use too too much, but I’d say a few times a week. Nothing like over the top.
background info:
He did it because he wanted to get rid of his pain. He is 6’3, 150lbs. His whole family besides his mom is super thin and tall. He grew over a foot in a year when he was younger where he had problems with his ankles because he grew too fast. He played lots of hockey from age 4-18. He was knocked down voer and over and over in hockey. Now his hips hurt him extremely and he has seen doctors and pain specialists but cant pin point anything. He ended up stealing some things from his parents home to get money. They think he does cocaine. But he doesnt. and he didnt get tons of money for what he stole.

his parents sent him to be evaluated by a psychiatrist to see what to do. the psychiatrist determined he substituted becuase he wasnt getting treated correctly. The guy also said that taking 3 PM tylenols is worse than a 40mg oxycodone and that he needs to see a different doctor and get better medicine. The psychiatrist also told him he has hope and he is completly normal for what he is doing becuase he isnt getting adequate meds.

He has a tox screening in a week. To see if he is abusing it.
So a few questions I have are:
How long does a tox usually take?
Are they gunna do a pee test or blood?
What is substitution?
Any other comments about this. NO NEGATIVE ONES. Or ones saying “thank god hes getting help” i know that already. I just want comments saying waht will happen next, etc.

THANKS, best answer.

Best answer:

Answer by Default
Substitutes = swap out.

What do you think? Answer below!