how long has it been since you smoked? if youre not a regular smoker its out of your system after just a couple days. pot is stored in your adipose tissue, so if youre skinny it gets out faster. and i dont think it shows up in your saliva? i think he would have had to do a urine test but im not sure on that one.

i agree with perna. explain the situation and what happened and tell him that its a one time thing and that you wont do it while you work there. maybe hell give you another test in a couple days.