Fentanyl and meth imported from China and other countries
EDIT: For naive downvoters. It is an observable fact. Drugs are destroying people and causing homelessness. I have witnessed it first hand.
https://www.youtube.com/watch?v=p5AeGKSDVdE
https://www.youtube.com/watch?v=SwlIAjcYypA
Look up "Philadelphia zombies"