One of the big things I learned from this tape in particular:
http://www.thesky973.com/pages/6406722.php
I note that Ron doesn't hesitate to take off from work to make a drug deal. It is explained in the tape.
This leaves me to wonder about Shoemaker's statements that Ron always went to work early, attempting to imply Ron was serious about his job. After watching the tapes and hearing his propensity to just take off work to make a drug deal, I have to wonder if Ron didn't go to work at PDM early for the same reasons. I also have to wonder how many times, if any, did he leave PDM for the same reason, to sell drugs or for other reasons. I am left to wonder that based on the way PDM let Ron go from his job. JMO - there is more to the story of why PDM let him go than the simple failure to call.