From a subjective basis, U4ea lasts over twice as long as meth. But I was looking for a more objective/impartial test that would hold watter in a civil dispute. In an uncivil dispute, it probably wouldn't matter, but at least you would know what you had aquired.
Also, mixing meth and U4ea and taking the hybrid in a smaller dose seems to have a constructive affect. I've been looking at this for a while, and am convinced of the reality of this. But sometimes the mix works as expected and other times it does not, and I suspect that many times the U4ea is actually Meth which would kill the hybrid affect. A test would put this issue to rest.
And on the eight day, God created Meth...
... and hasn't done much of anything usefull since!