This test was amazingly simple, the surface wipe for 10 drugs - once I gained my confidence and read the instructions. Found a small empty bag in sons room with dusting on the inside and also a little plastic test tube with clip lid, again with residue. Put liquid in the bag, just a little and then swished a tiny bit of liquid in the tube. Emptied both out onto a tea saucer and dripped the test end through it and replaced lid and waited. Really upset to see it was Ketamin and MDMA. Couldn't believe it picked it up. What it did do was arm me with enough bravery to take my son for a drive and to talk to him in an open and loving way about what was going on. He is 25 and has to make his own decisions but I needed to face the fact he was using even if it was recreationally. It all leads to nothing but misery. All I can say to you parents out there which is a bit of advice that helped us stop fighting, stop worrying was "Just Love your Son", we did and we do and we hand the rest over to God. Our son is well and working and is a lovely person but is the one out of all the "mates" that can't take drugs without it effecting him. Good luck, educate yourselves and be brave.