1. A modular detecting system comprising: a housing, a detector in the housing for analyzing a sample to determine whether the sample contains any substances of interest, a first sample collection apparatus configured for receiving a sample residue from a portion of a hand of a person and selectively placing the sample of residue in communication with the detector for analyzing the sample of residue collected directly from the person and a second sample collection apparatus configured differently than the first sample collection apparatus and having an opening for receiving at least a portion of an object and selectively placing a sample collected from the object in communication with the detector for analyzing the sample from the object.