Buying a duplex with tenants living in it

[Joseph D Chapman]

Looking to buy a duplex and both units are rented out already. I was looking to house-hack this property, so I called my agent and set up a time to look at the property. When we went to go look at the duplex both tenants were home, and inside the unit. (Very uncomfortable) You could smell marijuana in the first unit, and the second unit was poorly taken care of. (This is a re-build) How do I go about evicting both units?