"
I had talks with them and upper managment and was basically told to just supervise the job and mind my own business. Well, being relatively naive at the time I let it go at that"

Today's answer to that is an email sent to Corporate and your home e-address confirming that they want you to ignore sexual harassment and substance abuse by employees. When they write back that that is the case, confirm that you have the right to fire those who do so.

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Front sight and squeeze