and sorry for saying this... i think it should be made a law that all shity drivers have to carry a glass dick, with methimphitmine reson in it, but still make glass dicks to carry own or posess... cause ive noticed that if your carrying around something that can give you a felony conviction.... you drive alot better... anyways... if they use saliva testing... it would be alot more accurate to the last time you smoked, because it shows up for like 3 days only... and also for any one who has seen the result papers of a drug-test from a actualy labatory(not one of those test that you put the stick into and it turns blue for crack, and green for weed, and purple for meth or what ever, that you buy from the pharmacy) it shows actual numbers on of how many nano-grams or milli-grams for so much blood... showing that when you took the test... you can get a close estiment of the last time you smoked, or how much you smoke...