about marijuana DUIs. One is a public defender. He says he can tell without looking at the file which of his clients are MJ DUIs and which are alcohol DUIs. All he has to do is talk to the client for a few seconds. The MJ DUIs consistently appear less intelligent. It isn't scientific and it doesn't prove which way the causal link goes (is it the stupidity that causes the MJ use or does MJ use make people dumb). But he believes MJ makes people less intelligent. The other one agrees with the assessment of the first.