Having read up on bed bugs, I have decided to get very proactive. Called in the original pest control company to re-treat premises and possessions, and stressed they had to solve the problem. Part of their job is teaching the tenants their role in this–especially washing and drying at high temperature all bedding, clothing, etc. Their kids have sores from the bites, and I doubt they brought in the problem–it was the previous tenants–so they are the victims and this is more than just a legal problem. If necessary, I will pay them an agreed upon amount to leave, throw out all carpeting and nuke the place before the next tenant comes in.
To other Piggs: still want to try landlording?