Bed Bugs... who is responsible?

[Dick Rosen]

I just had a Phoenix tenant report that she has bed bugs. She said she has thrown 3 beds away trying to get rid of them. I suggested that they probably followed her from the apartment complex that she came from and naturally denied that possibility.

This building is nearly vacant and the only tenant in the building when she moved in 3-4 months ago, has been there for 10 years.

So who's responsible and how should I handle this? I have contacted 3 exterminators but I'm sure I won't hear back from them until Monday.