We were very pleased with the technician's knowledge regarding fleas. The treatments/chemicals he used have resolved the infestation. Additionally, he shared we must have possums in our yard. At his recommendation we sat a trap in the yard in addition to the one we had set for anything come out from under the house. We trapped and relocated three youth and possibly the mother possum. In May prior to using Stuarts, we had another exterminator who had treated the house twice plus daily spraying etc. The fleas just kept multiplying.