Hello there, They are probbally sending it to the lab to see if your urine was deluted (drinking to much water) or you tried to use something to cover it. It may come up inconclusive. How nervous was he when this happened? I came up positive on a drop test while on parole. I requested it to be sent to the lab myself because I knew I was clean. It turned out clean, there was a defective drop test. Also alot of different things can give you a false positive. Ibuprofin, and a few other things. I wouldn't sweat it to bad. Patients is a vertue