The ricin mailer is from here in Mississippi

Paul Kevin Curtis was arrested on charges relating to the letters to the POTUS and Mississippi Senator Roger
Wicker. Here is a story regarding Mr Curtis

the man would often rant endlessly on several local forums about the police harassing him regarding the hospital

Wow, him a little paranoid he. I guess he got his job back cleaning floors now, it’ll just be at a different location from now on.