Using these cocaine detection safety wipes is a piece of cake. First, find the folded towelette in the package. Then, take it out and gently wipe it over the substance you're suspicious about. Wait for a short while, and you'll see the result right away. If the pad turns light blue, it means there's cocaine. As for precautions, keep these wipes out of reach of children and store them in a cool, dry place. Also, make sure to use them before the expiration date. There's no special maintenance needed for these wipes. Just keep them in their original packaging until you're ready to use them, and you're good to go.