IamN2Pot-I am considering the substitution method also -I like having another option for the madness . Who do you run with and where? I would like to know more details on the d.o.t. tests and mary jane (random tests, giving a sample within 1 hour, etc...). I want to make sure I cover this well before I jump back in the "18 wheels of steel" if you know what I mean . I will make sure to read your page on this subject also. Thanks again.