disclosed is a testing device and methods for the identification of an analyte of interest in a sample . in a preferred embodiment , the testing device includes a front panel having at least one sample application aperture ; a rear panel having at least one solvent application aperture ; a sample collection matrix disposed between the rear panel and the front panel , the sample collection matrix being in communication with the sample and solvent application apertures of the front and rear panels ; and an insertable test strip containing a reagent enabling detection of the analyte of interest .