Without knowing the specifics of what the person is telling you, it is hard to advise. ?
The mehalech very successfully used in Chicago is to not address the mitzvos/aveiros aspect of the at-?risk behaviors and activities, he instead helps the teen regain his purpose in life by finding meaningful ?activities to engage in, the theory is once the teen is living a life again religion will follow on its own. ?Discussing schar and oneshor assur/muttar with someone who is in pain and angry is a bracha levatalah. ?