Bed Bugs in REO Purchase?

[Matt Schelberg]

I closed on a foreclosed rowhouse this week and during the clean-out yesterday, I found cans of aerosol bedbug-killer laying on the ground.  No "smoking gun" that there are bed bugs -- but the spray cans are a pretty strong indicator.  Should I bite the bullet and pay for an exterminator before starting the rehab?  

Additional background:  People were living in the house as recently as 1 month ago.  All carpet and furniture will be removed during the rehab.  I will keep the house as a rental property.

Should I have the property treated before the rehab?  Or will the full rehab kill anything that's there?