Kap'n Kronik

when it comes to hair tests, there seems to be lots of sketchy information. i just passed one by switching the hair sample. don't ask how i did it, it was amazing and extremely lucky. i'm not out of the woods yet though, i have another hair test on may 14 i believe, and i highly doubt i'll be lucky enough to switch the hair sample again so i'm exploring other options.
one thing which is to my advantage, is that i keep my hair quite short. about 1 inch on top, and about 1/2 inch or less on the back (which is where the hair is supposed to be cut for the test). now, if i'm correct, the hair test takes the most recent 1 1/2 inches of hair. if the hair is shorter than that, the testing period will be less. so i'm assuming, if i only have 1/2 inch of hair, then i can only be tested for 30 days. is this true? does the length of hair REALLY have something to do with it or is the 90 days the length of time the chemicals stay in the follicles or something like that?
i'm also looking at the shampoo's at www.ipassedmydrugtest.com. i don't know much about them (i plan to call them soon) but they seem to be the best shampoo's that ive seen on the market. they claim to remove toxins permanently instead of that 8 hour cover up bull**** that you see in many places. do these work?
basically, if not smoking from now until my test is the only thing that will work, than i guess that's what i'll do. but if this won't help at all, then i guess ill continue to smoke everyday if im gonna fail anyway.
as you all know, 420 is coming up, and i'd really like to be able to smoke on 420 which is why i want the shampoo, but if that won't work then i guess ill just have to stop.

please help me.

oh yea, im really really high right now and i dont wanna read through what i just wrote so if some of what i said didnt make sense just let me know and i'll correct it when im straight.
thanks again .