Our detection dogs are taken from room to room, if they pick up a scent, the dog is trained to passively alert on the spot (our handler will then mark the spot and further testing may be performed). Positive Controls ScentTECH is the only K9 detection company that utilises positive controls during their searches. This is a small sample of the target scent which the client hides in a previously cleared room. Finding this sample is proof that the dog is working to its maximum detection capability on the day of the search and allows the dog to be rewarded for a job well done.