What a tough question. When bed bug applications don’t work, the reason is usually that there are multiple parties involved and not everyone is doing their part. In a multi-dwelling building, the resident with a high bed bug tolerance level isn’t your friend. By the time they feel they have an issue, it has already spread to the adjoining units. Imagine someone coming home from work with a notice under their door stating, “you need to do eight hours of preparation and your apartment is going to sprayed.” They say, “but I don’t have an issue” and then choose not to do their part. Imagine that the property management company only agrees to treat the infested apartment, and not perform visual inspections on other apartments, or put together a proper strategy for the building. As you can see, there are many reasons why bed bug treatments sometimes fail. What is needed is for everyone to face the right direction and charge up the same hill. The more we quarrel and fight, the more the bed bugs thrive.