COCAINE TRACE WIPES (50/BOX) The MMC Cocaine Trace Wipes presumptively detect the presence of Cocaine by simply wiping over the suspected surface. Test results are immediate. A blue result presumptively identifies the presence of Cocaine and may be sufficient cause for further investigation. Each wipe is sensitive to trace amounts of residue; far less than could be collected for regular field testing. Each wipe is hermetically sealed in single-use foil envelopes. Unlimited shelf life assures these wipes will provide dependable results when you need them.