Tenants and Heroin Use. What is enough to get booted?

[Kim Knox]

First of all, Merry Christmas!  I hope your holiday is full of love and laughter.   I need your help, I am a bit out of my element.  I have  rental properties, but this problem is foreign to me.  It has me very worried.  

My dad has two homes on one lot, and he has moved into one of the houses for the winter.  It was not Santa that woke him at 4am this morning, it was the police and ambulance.

He rents to a single male, in his late 20's.  Apparantly the paramedics were called because a young lady had overdosed on heroin.  With all the commotion, my dad went to see what was going on.   The young lady was initially non responsive, but after the administered CPR, she came back to life.  Thank goodness, and the ambulance rushed her to the hospital.  

The police officer gave my dad his card and wrote "heroin overdose" on the card with reference to a case number.  My dad asked if his tenant was to be arrested after the cop indicated locating significant drug perophinelia inside the home.  No, they didn't find any remaining herion.  My dad was so shocked, and recently awoke, that he is a little hazey with the details.  

I believe because he was conducting illegal activity, my dad is able to offer him 72 hours to vacate.  We had scheduled a walk through for tomorrow.  My thought is that we should post 72 hour notice to vacate and copy the front and back of the police officers card referencing "heroin overdose" and that is it.  

I absolutely want this guy out of my dads home, but want to handle properly.  His lease does indicate no illegal activity, but because he didn't get arrested, is it enough that he nearly let a young lady die at the home, and/or the existence of drug perophinelia within the home, is that sufficient?  Should I enlist the assistance of the police to witness the 72 hour notice being posted.  I do not want my dad dealing with these people, I want him to post notice and go stay at his other home until the 72 hours expires.  He had some  inclination that his tenant was a bit "off,"so requested a walk though a few weeks ago, which will take place tomorrow.   Finding hardcore drugs to be the problem is mind boggling, and  totally unexpected.  What is the process that I need to follow to get this guy out of my dads house, and out of his life?  Does anyone have a 72 hour notice to vacate for the state of Oregon?  what should we do?