He shouts you down because he doesn’t want to answer your questions because you will catch him out
He will lie and not remember his answer
If he had to be sectioned he’s a very heavy user that has probably used for a long time
Crack usually involves using some kind of downer drugs like smoking heroin at the end or taking Valium or pregablin to help the come down crash
Very rarely will it be just crack
End it and move on.
Hard as it is do it for your own mental health