System for testing drugs of abuse or other analytes from a body fluid sample collected from a person being tested for drugs of abuse comprising: (a) an extraction wand for use in a device for testing a drug of abuse or other analyte from a body fluid sample collected from a person being tested for said drug or analyte comprising: a handle having a hollow internal cavity having at least one latching means internally positioned for retaining a stem constructed to fit slidably into said cavity so that said handle will be downwardly slidable over said stem, and an external configuration at its distal end that can apply compression to a sponge positioned upon said stem; a stem constructed to fit into said internal handle cavity, said stem further having a means at its distal end for retaining a sponge; and a sponge disposed at the distal end of said stem which is capable of absorbing a body fluid from the person to be tested for the presence of a drug or other analyte, and which is positioned on the stem so that the body fluid sample will be expressed from the sponge when the handle is brought downward over the stem and impinges upon said sponge; (b) a vial containing a buffer solution; (c) a dropper for removing solution from the vial and dispensing said solution; (d) a test device (30, 40, 50) comprising a reaction well (32, 42, 52) for receiving a buffer solution and containing an identifying reagent, an immunoassay test strip (38, 44, 58), and a means for contacting an immunoassay test strip (38, 44, 58) with said solution; said system is characterized in that the stem of the extraction wand has at least one protrusion on its external surface so that the latching means internally positioned in the cavity of the handle will retain the handle in a locked position when said handle is brought downward over the stem. (a) an extraction wand for use in a device for testing a drug of abuse or other analyte from a body fluid sample collected from a person being tested for said drug or analyte comprising: a handle having a hollow internal cavity having at least one latching means internally positioned for retaining a stem constructed to fit slidably into said cavity so that said handle will be downwardly slidable over said stem, and an external configuration at its distal end that can apply compression to a sponge positioned upon said stem; a stem constructed to fit into said internal handle cavity, said stem further having a means at its distal end for retaining a sponge; and a sponge disposed at the distal end of said stem which is capable of absorbing a body fluid from the person to be tested for the presence of a drug or other analyte, and which is positioned on the stem so that the body fluid sample will be expressed from the sponge when the handle is brought downward over the stem and impinges upon said sponge; a handle having a hollow internal cavity having at least one latching means internally positioned for retaining a stem constructed to fit slidably into said cavity so that said handle will be downwardly slidable over said stem, and an external configuration at its distal end that can apply compression to a sponge positioned upon said stem; a stem constructed to fit into said internal handle cavity, said stem further having a means at its distal end for retaining a sponge; and a sponge disposed at the distal end of said stem which is capable of absorbing a body fluid from the person to be tested for the presence of a drug or other analyte, and which is positioned on the stem so that the body fluid sample will be expressed from the sponge when the handle is brought downward over the stem and impinges upon said sponge; (b) a vial containing a buffer solution; (c) a dropper for removing solution from the vial and dispensing said solution; (d) a test device (30, 40, 50) comprising a reaction well (32, 42, 52) for receiving a buffer solution and containing an identifying reagent, an immunoassay test strip (38, 44, 58), and a means for contacting an immunoassay test strip (38, 44, 58) with said solution; said system is characterized in that the stem of the extraction wand has at least one protrusion on its external surface so that the latching means internally positioned in the cavity of the handle will retain the handle in a locked position when said handle is brought downward over the stem.