A method of detecting the presence of an analyte in an ion mobility spectrometer using an amide ionization reagent is provided. In a first etching step, at least the sacrificial oxide and nitride layers are etched to define opposing substantially vertical surfaces of at least the sacrificial oxide and nitride layers. The annular seals and plug body together seal the water supply line when the pipe test plug is inserted therein. At least two opposed nodes along the data loop are coupled to one another by a memory content check MCC sub-circuit. In this manner, the drainage system for the exterior of the structure does not require the use of gutters.