premise: Colarusso, the Dover police captain, said authorities are interested in whether their suspect made a cell phone call while he was in the Dover woman's home.
hypothesis: Colarusso doesn't think it's likely their suspect made a cell phone call while he was in the Dover woman's home.
reason: The passage said he was interested in knowing whether the suspect made the call. They didn't say whether they thought that he had or not... so there is no way to know for certain. 