When your son is released you have my best wishes that he stays clean and becomes a productive member of society.
I'm an extended member of your "dysfunctional family." While still a deputy sheriff I raised a grand daughter when her mom became a meth head. It took jail time for her to get clean and, like your son, it saved her life.
My 6-year old grandson now spends the majority of his time with us when my daughter-in-law became addicted to meth and walked out on my son and grandson.
Comparing meth to pot is akin to comparing working on the space shuttle to working on a VW bug in the driveway.