Did your son make it home?
I too have a 19 yr old son that I "kicked out" this past monday. It is VERY hard...but after 2 rehabs, 2 overdoses , a totaled car, too many run ins with the police, and too many other things to mention...I finally had to make the decision to let him go...And you will too ...eventually....when YOU are ready.
He must have enough friends to take him in as he hasnt called....
You will know when the time is right...trust your instincts! They're always right...