Help Needed with Squatter Friends

[Christie Gahan]

I buy REO duplex. Orig owner says he will fight bank foreclosure. ( Totally too late for that.)

Orig owner says he wasn't properly served eviction notice because he was in jail.  Therefor, I do not have the right to enter unit or change locks.  My prop manager says that could be a problem.  Orig owner is currently a guest of the US govt in a half way house.  But, now says his girlfriend lives there .... blah blah you get the picture.

How can I prevent his friends / squatters from moving in and then I have to evict squatters ?  I just see this as a giant loop.

I wouldn't mind selling to another investor but how to show unit ?